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OpenAPI Specification

openapi: 3.2.0
info:
  title: B2B Payments Seller API
  version: v2.3
servers:
- url: https://sandbox.finmid.com
  description: Sandbox
- url: https://api.finmid.com
  description: Live
security:
- apiKeyScheme: []
tags:
- name: Seller
paths:
  /api/v2/b2b-payments/sellers:
    post:
      tags:
      - Seller
      operationId: create-seller-v2
      summary: Create Seller
      description: 'Let''s create/onboard a new seller. For this you''ll need 2 things:

        1. Create a new ID for this seller (should map to your internal identifier)

        2. The seller''s legal information. ⚠️ Note that one of either business_registration_number or tax_number **must** be provided on creation.


        > 📘

        >

        > You should create a seller entity for every seller on your platform that can be part of a lending transaction.'
      requestBody:
        content:
          application/json:
            schema:
              required:
              - id
              - legal_name
              - legal_address
              - bank_accounts
              - email
              type: object
              properties:
                id:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1payment-requests~1{id}~1cancel/put/parameters/0/schema/allOf/0'
                  - description: 'Custom ID of the seller, should map to your internal identifier. Must consist only of a-z, A-Z, 0-9 and .-_ characters, and length should not exceed 100 characters.

                      '
                    example: seller-321
                legal_name:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/legal_name/allOf/0'
                  - description: 'Business name of the seller (not necessarily the brand name). This should be the name as stated in official business registers.

                      '
                    example: Coolstore GmbH
                business_registration_number:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/business_registration_number/allOf/0'
                  - description: 'Registration number of the seller from the commercial register.

                      '
                    example: HRB654321B
                tax_number:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/tax_number/allOf/0'
                  - description: 'Identification number assigned to the seller by local tax office.

                      '
                    example: 12/345/67890
                email:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/email/allOf/0'
                  - description: Email address of the seller.
                    example: coolstore@example.com
                phone:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/phone/allOf/0'
                  - description: Phone number of the seller. Must be provided in the international format, e.g. `+49123456789`.
                    example: '+49123456789'
                legal_address:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/legal_address/allOf/0'
                  - description: Legal address of the seller.
                    required:
                    - address_line_1
                    - postal_code
                    - city
                    - country
                    example:
                      address_line_1: Mustergasse 123
                      postal_code: '55441'
                      city: Musterhausen
                      state: Niedersachsen
                      country: DEU
                bank_accounts:
                  type: array
                  description: 'Bank account details used for payouts to seller

                    Note: only one bank account allowed per currency.

                    '
                  items:
                    oneOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}~1bank-details/patch/requestBody/content/application~1json/schema/properties/bank_account/oneOf/0'
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}~1bank-details/patch/requestBody/content/application~1json/schema/properties/bank_account/oneOf/1'
                    - title: SWIFT Bank Account
                      type: object
                      required:
                      - account_number
                      - account_number_type
                      - bic_swift
                      - address
                      - currency
                      properties:
                        account_number:
                          description: IBAN or AccountNumber of the seller.
                          type: string
                        account_number_type:
                          description: Type of the accountNumber field. Either 'IBAN' or 'ACCOUNT_NUMBER'
                          type: string
                        bic_swift:
                          description: BIC of the seller's bank.
                          type: string
                        address:
                          type: object
                          required:
                          - address_line
                          - city
                          - country
                          properties:
                            address_line:
                              description: First line of the address. This is usually a street name and house number combination.
                              type: string
                              maxLength: 100
                            city:
                              description: City of the address.
                              type: string
                              maxLength: 100
                            country:
                              $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/legal_address/allOf/0/properties/country'
                        currency:
                          allOf:
                          - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers~1{id}~1payment-limit/get/parameters/1/schema/allOf/0'
        required: true
      responses:
        '200':
          description: The seller was created successfully.
          content:
            application/json:
              schema:
                type: object
                required:
                - id
                - status
                - legal_name
                - bank_accounts
                properties:
                  id:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1payment-requests~1{id}~1cancel/put/parameters/0/schema/allOf/0'
                    - description: ID of the seller.
                      example: seller-321
                  status:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1list/get/parameters/0/schema/items'
                    - description: Current status of the seller.
                      example: PENDING
                  legal_name:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/legal_name/allOf/0'
                    - description: Legal name of the seller's business.
                      example: Coolstore GmbH
                  business_registration_number:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/business_registration_number/allOf/0'
                    - description: Business registration number of the seller.
                      example: HRB654321B
                  tax_number:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/tax_number/allOf/0'
                    - description: 'Identification number assigned to the buyer by local tax office.

                        '
                      example: 12/345/67890
                  email:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/email/allOf/0'
                    - description: Email address of the seller.
                      example: coolstore@example.com
                  phone:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/phone/allOf/0'
                    - description: Phone number of the seller in the international format (e.g. `+49987654321`).
                      example: '+49987654321'
                  legal_address:
                    allOf:
                    - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/legal_address/allOf/0'
                    - description: Legal address of the seller.
                      required:
                      - address_line_1
                      - postal_code
                      - city
                      - country
                      example:
                        address_line_1: Mustergasse 123
                        postal_code: '55441'
                        city: Musterhausen
                        state: Niedersachsen
                        country: DEU
                  bank_accounts:
                    type: array
                    description: Bank account details used for payouts to seller
                    items:
                      oneOf:
                      - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}~1bank-details/patch/requestBody/content/application~1json/schema/properties/bank_account/oneOf/0'
                      - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}~1bank-details/patch/requestBody/content/application~1json/schema/properties/bank_account/oneOf/1'
                      - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers/post/requestBody/content/application~1json/schema/properties/bank_accounts/items/oneOf/2'
        '401':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/401'
        '409':
          description: Seller exists already.
          content:
            application/json:
              schema:
                allOf:
                - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/400/content/application~1json/schema/allOf/0'
                - type: object
                  properties:
                    code:
                      type: string
                      enum:
                      - seller_conflict
                    description:
                      example: Cannot create this seller because it exists already
        '500':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/500'
  /api/v2/b2b-payments/sellers/list:
    get:
      tags:
      - Seller
      operationId: get-sellers-for-platform
      summary: Get Sellers
      description: Returns a list of sellers. Cursor-based pagination is supported and you can make use of filter parameters to change sorting or limit the results to only sellers with certain status..
      parameters:
      - name: status
        in: query
        required: false
        schema:
          type: array
          description: 'List of sellers status. Providing one or more status only includes sellers that have one of the provided status.

            '
          items:
            type: string
            enum:
            - PENDING
            - ACTIVE
            - INACTIVE
            - REJECTED
            - SUSPENDED
      - name: sort_by
        in: query
        required: false
        schema:
          description: Sorting of the results.
          type: string
          enum:
          - CREATED_ASC
          - CREATED_DESC
      - name: cursor
        in: query
        required: false
        schema:
          description: A cursor used for pagination.
          example: cGktMTIzNDV8MjAyMi0wNC0yOFQwNjowOToxNyswMDowMAo=
          type: string
      - name: limit
        in: query
        required: false
        schema:
          description: Limits the amount of results per page.
          example: 20
          type: integer
          format: int32
          default: 100
          minimum: 1
          maximum: 100
      responses:
        '200':
          description: A result set containing details of sellers.
          content:
            application/json:
              schema:
                type: object
                properties:
                  metadata:
                    type: object
                    properties:
                      next_cursor:
                        type: string
                        description: A cursor pointing to the beginning of the next page.
                        example: ddTkVYVHxwMzA1ZjBlNi00YzM2LTQwZmEtOTI5YS0yZjJiODJlYjU2ZjR8MjAyMi0xMC0yOFQxMDoxMDoyOS4zMTkzMDlafA
                      previous_cursor:
                        type: string
                        description: A cursor pointing to the beginning of the previous page.
                        example: ddUFJFVklPVVN8ZjhjODRmYzctZDIyMS00NzYxLThlMTktN2QxYTM5ZTIyZDgxfDIwMjItMTEtMDJUMTM6NTE6MTkuMzI3MTk1Wnw
                  data:
                    description: List of Sellers.
                    type: array
                    items:
                      $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers/post/responses/200/content/application~1json/schema'
        '401':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/401'
        '500':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/500'
  /api/v2/b2b-payments/sellers/{id}:
    get:
      tags:
      - Seller
      operationId: get-seller-v2
      summary: Get Seller
      description: For getting a certain seller's details, you'll only need the seller's ID specified on creation.
      parameters:
      - name: id
        description: ID of the seller as specified on seller creation.
        in: path
        required: true
        schema:
          $ref: '#/paths/~1api~1v2~1b2b-payments~1payment-requests~1{id}~1cancel/put/parameters/0/schema/allOf/0'
      responses:
        '200':
          description: Details of the requested seller.
          content:
            application/json:
              schema:
                $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers/post/responses/200/content/application~1json/schema'
        '401':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/401'
        '404':
          description: No seller found for the given ID.
          content:
            application/json:
              schema:
                allOf:
                - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/400/content/application~1json/schema/allOf/0'
                - type: object
                  properties:
                    code:
                      type: string
                      enum:
                      - seller_invalid
                    description:
                      example: Seller with ID seller-000 does not exist
        '500':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/500'
    patch:
      tags:
      - Seller
      x-tags:
      - PatchSeller
      operationId: update-seller-v2
      summary: Update Seller
      description: 'Update a seller if certain data changes on your platform. For this you''ll need:

        1. The seller''s ID specified on creation

        2. The data you want to change'
      parameters:
      - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}/get/parameters/0'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                legal_name:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/legal_name/allOf/0'
                  - description: New legal name of the business.
                    example: HappyCandles GmbH
                email:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/email/allOf/0'
                  - description: New email address of the seller.
                    example: happy-candles@example.com
                phone:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/phone/allOf/0'
                  - description: New phone number of the seller.
                    example: '+49987654321'
                legal_address:
                  allOf:
                  - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/requestBody/content/application~1json/schema/properties/legal_address/allOf/0'
                  - description: New legal address of the seller.
                    example:
                      address_line_1: Musterweg 100 a
                      postal_code: '54321'
                      city: Musterhausen
                      state: Brandenburg
                      country: DEU
        required: true
      responses:
        '200':
          description: Updated seller details.
          content:
            application/json:
              schema:
                $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers/post/responses/200/content/application~1json/schema'
        '401':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/401'
        '404':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}/get/responses/404'
        '500':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/500'
  /api/v2/b2b-payments/sellers/{id}/bank-details:
    patch:
      tags:
      - Seller
      x-tags:
      - PatchSeller
      operationId: update-seller-bank-account-v2
      summary: Update Seller Bank Account
      description: 'Update a seller''s bank account details. For this you''ll need: 1. The seller''s ID specified on creation

        2. The new bank account details.

        Note: This currently is only supported for sellers with a single bank account.'
      parameters:
      - $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}/get/parameters/0'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              required:
              - bank_account
              properties:
                bank_account:
                  oneOf:
                  - title: SEPA Account
                    type: object
                    required:
                    - iban
                    - currency
                    properties:
                      iban:
                        description: IBAN of the seller.
                        type: string
                      bic:
                        description: BIC of the seller's bank.
                        type: string
                      currency:
                        allOf:
                        - $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers~1{id}~1payment-limit/get/parameters/1/schema/allOf/0'
                  - title: FPS Account
                    type: object
                    required:
                    - sort_code
                    - account_number
                    - currency
                    properties:
                      sort_code:
                        description: 6-digit sort code of the seller's account.
                        type: string
                        minLength: 6
                        maxLength: 6
                        pattern: ^\d+$
                      account_number:
                        description: 8-digit number of the seller's account.
                        type: string
                        minLength: 8
                        maxLength: 8
                        pattern: ^\d+$
                      bank_code:
                        description: Bank code of the seller's account.
                        type: string
                        minLength: 4
                        maxLength: 4
                      currency:
                        allOf:
                        - description: Three-letter currency code (ISO 4217). Supported currencies `GBP`.
                          type: string
                          example: GBP
        required: true
      responses:
        '200':
          description: Updated seller details.
          content:
            application/json:
              schema:
                $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers/post/responses/200/content/application~1json/schema'
        '401':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/401'
        '404':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1sellers~1{id}/get/responses/404'
        '500':
          $ref: '#/paths/~1api~1v2~1b2b-payments~1buyers/post/responses/500'
components:
  securitySchemes:
    apiKeyScheme:
      type: apiKey
      in: header
      name: X-API-KEY
x-provenance:
  method: searched
  source: https://docs.finmid.com/reference
  harvested: '2026-10-14'
  tool: harvest-readme-openapi.py
  note: Assembled verbatim from the OpenAPI definition ReadMe embeds in each operation page of the provider's developer portal; paths and components merged by API title, nothing authored.
  assembled_from:
  - https://docs.finmid.com/reference/cancel-payment-request-v2.md
  - https://docs.finmid.com/reference/create-buyer-v2.md
  - https://docs.finmid.com/reference/create-payment-request-payout.md
  - https://docs.finmid.com/reference/create-payment-request-v2.md
  - https://docs.finmid.com/reference/create-seller-v2.md
  - https://docs.finmid.com/reference/get-buyer-limit-v2.md
  - https://docs.finmid.com/reference/get-buyer-v2.md
  - https://docs.finmid.com/reference/get-buyers-for-platform.md
  - https://docs.finmid.com/reference/get-payment-request-v2.md
  - https://docs.finmid.com/reference/get-payment-requests-v2.md
  - https://docs.finmid.com/reference/get-seller-v2.md
  - https://docs.finmid.com/reference/get-sellers-for-platform.md
  - https://docs.finmid.com/reference/get-tasks.md
  - https://docs.finmid.com/reference/simulate-buyer-v2.md
  - https://docs.finmid.com/reference/simulate-payment-request-repayment-v2.md
  - https://docs.finmid.com/reference/simulate-seller-v2.md
  - https://docs.finmid.com/reference/update-buyer-v2.md
  - https://docs.finmid.com/reference/update-payment-request-v2.md
  - https://docs.finmid.com/reference/update-seller-bank-account-v2.md
  - https://docs.finmid.com/reference/update-seller-v2.md
  - https://docs.finmid.com/reference/upload-payment-request-documents.md
  merge:
    pages: 21
    deduped: 119
    conflicts_kept_first: 0