MethodFi Simulate Entities API

openapi: 3.1.0
info:
  title: Method Account Attributes Simulate Entities API
  version: '2025-12-01'
  license:
    name: Proprietary
    url: https://methodfi.com
  description: "The Method API enables you to retrieve financial data, create payments, and manage\nentities and accounts programmatically. This specification covers the public API\nsurface for version `2025-12-01`.\n\n## Authentication\n\nMost API requests require a Bearer token in the `Authorization` header.\nUse your secret key (`sk_...`) for server-side requests and public key (`pk_...`)\nfor client-side Element requests. Public Message-Level Encryption key discovery\nendpoints are documented separately and do not require authentication.\n\n## Versioning\n\nThe API version is selected via the `Method-Version` header. This spec targets\nversion `2025-12-01`. The SDK sets this header automatically.\n\n## Response Envelope\n\nMost JSON responses are wrapped in a standard envelope:\n\n```json\n{\n  \"success\": true,\n  \"data\": { ... },\n  \"message\": null\n}\n```\n\nThe `/.well-known/jwks.json` endpoint is an exception and returns a bare JWK set.\n\n## Pagination\n\nList endpoints return pagination metadata in response headers:\n`Pagination-Page`, `Pagination-Page-Count`, `Pagination-Page-Limit`,\n`Pagination-Total-Count`, `Pagination-Page-Cursor-Prev`, `Pagination-Page-Cursor-Next`.\n\n## Expandable Fields\n\nCertain resource fields can be expanded from IDs to full objects using the\n`expand` query parameter. Maximum nesting depth is 4 levels.\n"
  contact:
    name: Method Financial
    url: https://methodfi.com
    email: team@methodfi.com
servers:
- url: https://production.methodfi.com
  description: Production
- url: https://sandbox.methodfi.com
  description: Sandbox
- url: https://dev.methodfi.com
  description: Development
security:
- SecretKey: []
tags:
- name: Simulate Entities
  description: Sandbox entity simulation
paths:
  /simulate/entities/{entity_id}/credit_scores/{crs_id}:
    post:
      operationId: simulateEntityCreditScore
      summary: Simulate a credit score
      description: 'Simulates a credit score result for an entity in the sandbox environment.

        Use this to test credit score retrieval flows during development.


        **Development only** - This endpoint is only available in the sandbox environment.

        '
      tags:
      - Simulate Entities
      security:
      - SecretKey: []
      parameters:
      - $ref: '#/components/parameters/method_version'
      - name: entity_id
        in: path
        required: true
        description: Unique identifier for the entity.
        schema:
          type: string
          pattern: ^ent_\w+$
      - name: crs_id
        in: path
        required: true
        description: Unique identifier for the credit score resource.
        schema:
          type: string
          pattern: ^crs_\w+$
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - score
              properties:
                score:
                  type: integer
                  description: The credit score value to simulate.
                  minimum: 300
                  maximum: 850
                status:
                  type: string
                  description: The status to set on the credit score resource.
      responses:
        '200':
          description: The simulated credit score result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EntityCreditScoreResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/InternalError'
  /simulate/entities/{entity_id}/connect:
    post:
      operationId: simulateEntityConnect
      summary: Simulate entity connect
      description: 'Simulates the entity connect flow in the sandbox environment.

        Use this to test account discovery and connection flows during development.


        **Development only** - This endpoint is only available in the sandbox environment.

        '
      tags:
      - Simulate Entities
      security:
      - SecretKey: []
      parameters:
      - $ref: '#/components/parameters/method_version'
      - name: entity_id
        in: path
        required: true
        description: Unique identifier for the entity.
        schema:
          type: string
          pattern: ^ent_\w+$
      responses:
        '200':
          description: The simulated connect result.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EntityConnectResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/InternalError'
  /simulate/entities/{entity_id}/attributes:
    post:
      operationId: simulateEntityAttributes
      summary: Simulate entity attributes
      description: 'Simulates attribute data for an entity in the sandbox environment.

        Use this to test attribute retrieval flows during development.


        **Development only** - This endpoint is only available in the sandbox environment.

        '
      tags:
      - Simulate Entities
      security:
      - SecretKey: []
      parameters:
      - $ref: '#/components/parameters/method_version'
      - name: entity_id
        in: path
        required: true
        description: Unique identifier for the entity.
        schema:
          type: string
          pattern: ^ent_\w+$
      responses:
        '200':
          description: The simulated entity attributes.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EntityAttributeResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
        '500':
          $ref: '#/components/responses/InternalError'
components:
  schemas:
    ErrorObject:
      type: object
      required:
      - type
      - code
      - message
      properties:
        type:
          type: string
          description: Error type category.
          enum:
          - invalid_request
          - api_error
          - resource_error
        code:
          type: integer
          description: Numeric error code. Common codes include 400 (bad request), 401 (unauthorized), 403 (forbidden), 404 (not found), 422 (unprocessable entity), 429 (rate limited), and 500 (internal error).
        sub_type:
          type:
          - string
          - 'null'
          description: More specific error classification.
        message:
          type: string
          description: Human-readable error description.
    EntityCreditScoreResponse:
      allOf:
      - $ref: '#/components/schemas/SuccessEnvelope'
      - type: object
        properties:
          data:
            $ref: '#/components/schemas/EntityCreditScore'
    EntityConnect:
      type: object
      required:
      - id
      - entity_id
      - status
      - accounts
      - requested_products
      - requested_subscriptions
      - created_at
      - updated_at
      properties:
        id:
          type: string
          description: Unique identifier for the connect session.
          example: cxn_iENwGBMDnr7sJ
        entity_id:
          type: string
          description: The ID of the entity this connect session belongs to.
          example: ent_au22b1fbFJbp8
        status:
          type: string
          description: Status of the connect session.
          enum:
          - completed
          - in_progress
          - pending
          - failed
        accounts:
          type: array
          items:
            title: EntityConnectExpandableAccount
            oneOf:
            - type: string
              pattern: ^acc_\w+$
            - $ref: '#/components/schemas/Account'
          description: Expandable. List of account IDs connected through this session.
        requested_products:
          type:
          - array
          - 'null'
          description: Products requested for this connect session.
          items:
            type: string
        requested_subscriptions:
          type:
          - array
          - 'null'
          description: Subscriptions requested for this connect session.
          items:
            type: string
        error:
          type:
          - object
          - 'null'
          description: Error details if the resource encountered an error.
          allOf:
          - $ref: '#/components/schemas/ConnectResourceError'
        created_at:
          type: string
          format: date-time
          description: Timestamp when the connect session was created.
        updated_at:
          type: string
          format: date-time
          description: Timestamp when the connect session was last updated.
    UpdateResourceError:
      type:
      - object
      - 'null'
      description: Error details when an account update fails.
      required:
      - type
      - code
      - sub_type
      - message
      properties:
        type:
          type: string
          description: The category of update error.
          enum:
          - UPDATE_FAILED
        code:
          type: integer
          description: Numeric error code (21XXX range).
          enum:
          - 21001
        sub_type:
          type: string
          description: Specific update error classification.
          enum:
          - UPDATE_TEMPORARILY_UNAVAILABLE
        message:
          type: string
          description: Human-readable error description.
      example:
        type: UPDATE_FAILED
        code: 21001
        sub_type: UPDATE_TEMPORARILY_UNAVAILABLE
        message: Update is temporarily unavailable for this account.
    AccountSensitive:
      type: object
      description: Sensitive data for an account.
      required:
      - id
      - account_id
      - status
      - type
      - fields
      - created_at
      - updated_at
      properties:
        id:
          type: string
          description: Unique identifier for the sensitive record.
          pattern: ^astv_\w+$
          example: astv_aTJMbnCjw34yQ
        account_id:
          type: string
          description: The account this sensitive data belongs to.
          pattern: ^acc_\w+$
        status:
          type: string
          description: Current status of the sensitive data request.
          enum:
          - completed
          - pending
          - failed
        type:
          type: string
          description: The type of sensitive data.
        fields:
          type: array
          description: List of sensitive data fields retrieved.
          items:
            type: object
            properties:
              name:
                type: string
                description: Name of the field.
              value:
                type: string
                description: Value of the field.
        error:
          $ref: '#/components/schemas/AccountSensitiveResourceError'
        created_at:
          type: string
          format: date-time
          description: Timestamp when the sensitive record was created.
        updated_at:
          type: string
          format: date-time
          description: Timestamp when the sensitive record was last updated.
    EntityCreditScore:
      type: object
      required:
      - id
      - entity_id
      - status
      - scores
      - created_at
      - updated_at
      properties:
        id:
          type: string
          description: Unique identifier for the credit score.
          example: crs_pn4ca33GRnrJm
        entity_id:
          type: string
          description: The ID of the entity this credit score belongs to.
          example: ent_au22b1fbFJbp8
        status:
          type: string
          description: Status of the credit score retrieval.
          enum:
          - completed
          - in_progress
          - pending
          - failed
        scores:
          type:
          - array
          - 'null'
          description: Array of credit score results.
          items:
            type: object
            required:
            - score
            - source
            - model
            - factors
            - created_at
            properties:
              score:
                type:
                - integer
                - 'null'
                description: The credit score value.
              source:
                type:
                - string
                - 'null'
                description: The source of the credit score.
              model:
                type:
                - string
                - 'null'
                description: The scoring model used.
              factors:
                type:
                - array
                - 'null'
                description: Factors affecting the credit score.
                items:
                  $ref: '#/components/schemas/EntityCreditScoreFactor'
              created_at:
                type: string
                format: date-time
                description: Timestamp when this score was generated.
        error:
          type:
          - object
          - 'null'
          description: Error details if the resource encountered an error.
          allOf:
          - $ref: '#/components/schemas/CreditScoreResourceError'
        created_at:
          type: string
          format: date-time
          description: Timestamp when the credit score was created.
        updated_at:
          type: string
          format: date-time
          description: Timestamp when the credit score was last updated.
    PayoffResourceError:
      type:
      - object
      - 'null'
      description: Error details when a payoff sync fails.
      required:
      - type
      - code
      - sub_type
      - message
      properties:
        type:
          type: string
          description: The category of payoff error.
          enum:
          - PAYOFF_FAILED
        code:
          type: integer
          description: Numeric error code (18XXX range).
          enum:
          - 18001
        sub_type:
          type: string
          description: Specific payoff error classification.
          enum:
          - PAYOFF_TEMPORARILY_UNAVAILABLE
        message:
          type: string
          description: Human-readable error description.
      example:
        type: PAYOFF_FAILED
        code: 18001
        sub_type: PAYOFF_TEMPORARILY_UNAVAILABLE
        message: Payoff is temporarily unavailable for this account.
    AccountExpandableBalance:
      title: AccountExpandableBalance
      description: 'The latest balance ID. This field is expandable. When expanded, returns the full AccountBalance object.

        '
      oneOf:
      - type: string
        pattern: ^bal_\w+$
      - type: 'null'
      - $ref: '#/components/schemas/AccountBalance'
    EntityAttribute:
      type: object
      required:
      - id
      - entity_id
      - status
      - attributes
      - created_at
      - updated_at
      properties:
        id:
          type: string
          description: Unique identifier for the entity attribute.
          example: attr_QwMjMDEwMTY1
        entity_id:
          type: string
          description: The ID of the entity this attribute belongs to.
          example: ent_au22b1fbFJbp8
        status:
          type: string
          description: Status of the attribute retrieval.
          enum:
          - completed
          - in_progress
          - pending
          - failed
        attributes:
          $ref: '#/components/schemas/EntityAttributeData'
        error:
          type:
          - object
          - 'null'
          description: Error details if the resource encountered an error.
          allOf:
          - $ref: '#/components/schemas/ResourceError'
        created_at:
          type: string
          format: date-time
          description: Timestamp when the attribute was created.
        updated_at:
          type: string
          format: date-time
          description: Timestamp when the attribute was last updated.
    EntityAttributeData:
      type:
      - object
      - 'null'
      description: Financial health and credit attribute data.
      properties:
        credit_health_credit_card_usage:
          type:
          - object
          - 'null'
          description: Credit card usage health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_derogatory_marks:
          type:
          - object
          - 'null'
          description: Derogatory marks health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_hard_inquiries:
          type:
          - object
          - 'null'
          description: Hard inquiries health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_soft_inquiries:
          type:
          - object
          - 'null'
          description: Soft inquiries health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_total_accounts:
          type:
          - object
          - 'null'
          description: Total accounts health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_open_accounts:
          type:
          - object
          - 'null'
          description: Open accounts health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_credit_age:
          type:
          - object
          - 'null'
          description: Credit age health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_payment_history:
          type:
          - object
          - 'null'
          description: Payment history health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
        credit_health_entity_delinquent:
          type:
          - object
          - 'null'
          description: Entity delinquency health indicator.
          properties:
            value:
              type:
              - number
              - 'null'
              description: The attribute value.
            rating:
              type: string
              description: Rating for this attribute.
            metadata:
              type:
              - object
              - 'null'
              description: Additional metadata.
    AccountVerificationSessionResourceError:
      type:
      - object
      - 'null'
      description: Error details when an account verification session fails.
      required:
      - type
      - code
      - sub_type
      - message
      properties:
        type:
          type: string
          description: The category of verification session error.
          enum:
          - ACCOUNT_VERIFICATION_SESSION_FAILED
        code:
          type: integer
          description: Numeric error code (16XXX range).
          enum:
          - 16001
          - 16002
          - 16003
          - 16004
        sub_type:
          type: string
          description: Specific verification session error classification.
          enum:
          - VERIFICATION_TYPE_NOT_SUPPORTED
          - INVALID_DETAILS
          - VERIFICATION_SESSION_ATTEMPT_LIMIT_REACHED
          - MICRO_DEPOSITS_FAILED
        message:
          type: string
          description: Human-readable error description.
      example:
        type: ACCOUNT_VERIFICATION_SESSION_FAILED
        code: 16001
        sub_type: VERIFICATION_TYPE_NOT_SUPPORTED
        message: The verification type provided is not supported for the merchant.
    AccountExpandableSensitive:
      title: AccountExpandableSensitive
      description: 'The latest sensitive ID. This field is expandable. When expanded, returns the full AccountSensitive object.

        '
      oneOf:
      - type: string
        pattern: ^astv_\w+$
      - type: 'null'
      - $ref: '#/components/schemas/AccountSensitive'
    AccountPaymentInstrument:
      type: object
      description: A payment instrument for an account.
      required:
      - id
      - account_id
      - status
      - type
      - created_at
      - updated_at
      properties:
        id:
          type: string
          description: Unique identifier for the payment instrument.
          pattern: ^pmt_inst_\w+$
          example: pmt_inst_aTJMbnCjw34yQ
        account_id:
          type: string
          description: The account this payment instrument belongs to.
          pattern: ^acc_\w+$
        status:
          type: string
          description: Current status of the payment instrument.
          enum:
          - pending
          - in_progress
          - completed
        type:
          type: string
          description: The type of payment instrument.
          enum:
          - card
          - network_token
          - inbound_achwire_payment
        chargeable:
          type: boolean
          description: Whether this payment instrument is currently chargeable.
        card:
          type:
          - object
          - 'null'
          description: Card details. Present when type is card.
          properties:
            number:
              type: string
              description: The card number.
            exp_month:
              type: string
              description: Card expiration month.
            exp_year:
              type: string
              description: Card expiration year.
            billing_zip_code:
              type: string
              description: Billing zip code.
        network_token:
          type:
          - object
          - 'null'
          description: Network token details. Present when type is network_token.
          properties:
            token:
              type: string
              description: The network token value.
        inbound_achwire_payment:
          type:
          - object
          - 'null'
          description: ACH/wire payment details. Present when type is inbound_achwire_payment.
          properties:
            account_number:
              type: string
              description: The account number.
            routing_number:
              type: string
              description: The routing number.
        error:
          $ref: '#/components/schemas/ResourceError'
        created_at:
          type: string
          format: date-time
          description: Timestamp when the payment instrument was created.
        updated_at:
          type: string
          format: date-time
          description: Timestamp when the payment instrument was last updated.
    EntityAttributeResponse:
      allOf:
      - $ref: '#/components/schemas/SuccessEnvelope'
      - type: object
        properties:
          data:
            $ref: '#/components/schemas/EntityAttribute'
    EntityCreditScoreFactor:
      type: object
      properties:
        code:
          type:
          - string
          - 'null'
          description: Factor code.
        description:
          type:
          - string
          - 'null'
          description: Human-readable description of the factor.
    EntityConnectResponse:
      allOf:
      - $ref: '#/components/schemas/SuccessEnvelope'
      - type: object
        properties:
          data:
            $ref: '#/components/schemas/EntityConnect'
    CreditScoreResourceError:
      type:
      - object
      - 'null'
      description: Error details when a credit score pull fails.
      required:
      - type
      - code
      - sub_type
      - message
      properties:
        type:
          type: string
          description: The category of credit score error.
          enum:
          - CREDIT_SCORE_FAILED
        code:
          type: integer
          description: Numeric error code (23XXX range).
          enum:
          - 23001
        sub_type:
          type: string
          description: Specific credit score error classification.
          enum:
          - CREDIT_SCORE_FAILED_TEMPORARILY_UNAVAILABLE
        message:
          type: string
          description: Human-readable error description.
      example:
        type: CREDIT_SCORE_FAILED
        code: 23001
        sub_type: CREDIT_SCORE_FAILED_TEMPORARILY_UNAVAILABLE
        message: Credit Score is temporarily unavailable for this entity.
    MerchantProviderIds:
      type: object
      properties:
        plaid:
          type: array
          items:
            type: string
        mx:
          type: array
          items:
            type: string
        finicity:
          type: array
          items:
            type: string
        dpp:
          type: array
          items:
            type: string
        rpps:
          type: array
          items:
            type: string
    AccountExpandableAttribute:
      title: AccountExpandableAttribute
      description: 'The latest attribute ID. This field is expandable. When expanded, returns the full AccountAttribute object.

        '
      oneOf:
      - type: string
        pattern: ^acc_attr_\w+$
      - type: 'null'
      - $ref: '#/components/schemas/AccountAttribute'
    AccountExpandableUpdate:
      title: AccountExpandableUpdate
      description: 'The latest update ID. This field is expandable. When expanded, returns the full AccountUpdate object.

        '
      oneOf:
      - type: string
        pattern: ^upd_\w+$
      - type: 'null'
      - $ref: '#/components/schemas/AccountUpdate'
    AccountExpandableCardBrand:
      title: AccountExpandableCardBrand
      description: 'The latest card brand ID. This field is expandable. When expanded, returns the full AccountCardBrand object.

        '
      oneOf:
      - type: string
        pattern: ^cbrd_\w+$
      - type: 'null'
      - $ref: '#/components/schemas/AccountCardBrand'
    Metadata:
      type:
      - object
      - 'null'
      additionalProperties: true
      description: Arbitrary key-value metadata attached to the resource.
    AccountDebitCard:
      type:
      - object
      - 'null'
      description: Debit card account details. Present when `type` is `debit_card`.
      properties:
        network:
          type: string
          description: The card network.
        mask:
          type: string
          description: Last 4 digits of the card number.
        issuer:
          type: string
          description: The card issuer.
    MerchantType:
      type: string
      enum:
      - auto_loan
      - bank
      - bnpl
      - business_loan
      - city
      - collection
      - county
      - credit_builder
      - credit_card
      - electric_utility
      - fintech
      - home_equity_loan
      - home_loan
      - insurance
      - internet_utility
      - loan
      - medical
      - mortgage
      - personal_loan
      - student_loan
      - student_loans
      - subscription
      - telephone_utility
      - television_utility
      - unknown
      - utility
      - waste_utility
      - water_utility
    AccountExpandablePaymentInstrument:
      title: AccountExpandablePaymentInstrument
      description: 'The latest payment instrument ID. This field is expandable. When expanded, returns the full AccountPaymentInstrument object.

        '
      oneOf:
      - type: string
        pattern: ^pmt_inst_\w+$
      - type: 'null'
      - $ref: '#/components/schemas/AccountPaymentInstrument'
    AccountExpandablePayoff:
      title: AccountExpandablePayoff
      description: 'The latest payoff ID. This field is expandable. When expanded, returns the full AccountPayoff object.

        '
      oneOf:
      - type: string
        pattern: ^pyf_\w+$
      - type: 'null'
      - $ref: '#/components/schemas/AccountPayoff'
    AccountSensitiveResourceError:
      type:
      - object
      - 'null'
      description: Error details when retrieving account sensitive data fails.
      required:
      - type
      - code
      - sub_type
      - message
      properties:
        type:
          type: string
          description: The category of sensitive data error.
          enum:
          - ACCOUNT_SENSITIVE_FAILED
        code:
          type: integer
          description: Numeric error code (17XXX range).
          enum:
          - 17001
        sub_type:
          type: string
          description: Specific sensitive data error classification.
          enum:
          - ACCOUNT_SENSITIVE_FAILED_VERIFICATION_REQUIRED
        message:
          type: string
          description: Human-readable error description.
      example:
        type: ACCOUNT_SENSITIVE_FAILED
        code: 17001
        sub_type: ACCOUNT_SENSITIVE_FAILED_VERIFICATION_REQUIRED
        message: Account sensitive failed due to missing required verification.
    AccountResourceError:
      type:
      - object
      - 'null'
      description: Error details when an account is disabled.
      required:
      - type
      - code
      - sub_type
      - message
      properties:
        type:
          type: string
          description: The category of account error.
          enum:
          - ACCOUNT_DISABLED
        code:
          type: integer
          description: Numeric error code (11XXX range).
          enum:
          - 11001
          - 11002
          - 11003
          - 11004
          - 11005
          - 11006
        sub_type:
          type: string
          description: Specific account error classification.
          enum:
          - ACCOUNT_INVALID_DETAILS
          - ACCOUNT

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# Full source: https://raw.githubusercontent.com/api-evangelist/methodfi/refs/heads/main/openapi/methodfi-simulate-entities-api-openapi.yml