MandateShield Protocol adapters API

openapi: 3.2.0
info:
  title: MandateShield Payment Authority Protocol adapters API
  version: 3.4.0
  description: Fail-closed authority verification, provider-bound execution permits and provider-outcome reconciliation that is caller-report-independent for autonomous AI-agent purchases.
  termsOfService: https://mandateshield.com/terms
  contact:
    name: Gökhan Vodinali · MandateShield operator
    url: https://mandateshield.com/legal
    email: support@hemelion.com
servers:
- url: https://mandateshield.com
tags:
- name: Protocol adapters
  description: Stateless documented-field projection for supported agent-payment inputs. X402 and MPP require a canonical payee identity whose rail-specific fields exactly match the source. A successful projection is not full source-protocol conformance or independent trust-evidence verification; output is deliberately non-executable and must pass strict authority verification before use.
paths:
  /api/v2/normalize:
    post:
      operationId: normalizeAgentPaymentProtocol
      tags:
      - Protocol adapters
      summary: Project AP2, x402 v2, or MPP payment fields
      description: Maps one documented source projection into the deterministic MandateShield purchase envelope. X402 requires exact network+payTo identity plus a trusted merchant-mapping evidence reference; MPP requires exact HTTPS service origin+method identity. projection_fields_valid=true means only that supported fields and explicit mappings passed. The endpoint does not fetch or independently verify the evidence reference, establish full source-protocol conformance, or verify source signature, issuer trust, delegated authority, payment credential, or settlement; it always returns enforcement_authorized=false. Strict v2 verification remains mandatory.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties: false
              required:
              - adapter
              - source
              - context
              properties:
                adapter:
                  type: string
                  enum:
                  - AP2_CLOSED_PAYMENT_SD_JWT
                  - X402_V2_PAYMENT_REQUIRED
                  - MPP_HTTP_PAYMENT_CHALLENGE
                source:
                  description: 'Raw protocol input: AP2 compact SD-JWT, x402 PAYMENT-REQUIRED base64 JSON, MPP WWW-Authenticate Payment challenge, or the documented decoded object.'
                context:
                  type: object
                  additionalProperties: false
                  required:
                  - mandate_id
                  - agent_id
                  properties:
                    mandate_id:
                      type: string
                      minLength: 1
                      maxLength: 240
                    agent_id:
                      type: string
                      minLength: 1
                      maxLength: 240
                    idempotency_key:
                      type: string
                      minLength: 1
                      maxLength: 256
                    created_at:
                      type: string
                      format: date-time
                    merchant_id:
                      type: string
                      minLength: 1
                      maxLength: 240
                    resource:
                      type: string
                      minLength: 1
                      maxLength: 2048
                    asset_id:
                      type: string
                      minLength: 1
                      maxLength: 500
                    asset_decimals:
                      type: integer
                      minimum: 0
                      maximum: 30
                    user_consent:
                      type: boolean
                    amount_unit:
                      type: string
                      enum:
                      - MINOR_UNITS
                      - ATOMIC_UNITS
                    mpp_request_profile:
                      type: string
                      enum:
                      - MANDATESHIELD_PORTABLE_CHARGE_V1
                      description: Required for MPP because the core protocol delegates request field semantics to method-specific specifications.
                    x402_execution_profile:
                      type: string
                      enum:
                      - MANDATESHIELD_X402_V2_EXACT_EIP3009_V1
                      description: Opt-in strict first-party x402 execution binding. Requires method and exact request digests.
                    http_method:
                      type: string
                      enum:
                      - GET
                      - HEAD
                      - POST
                      - PUT
                      - PATCH
                      - DELETE
                    http_body_sha256:
                      type: string
                      pattern: ^sha256:[a-f0-9]{64}$
                    http_headers_sha256:
                      type: string
                      pattern: ^sha256:[a-f0-9]{64}$
                    payee_identity:
                      type: object
                      additionalProperties: false
                      required:
                      - profile
                      - provider
                      - merchant_id
                      - binding
                      - verification
                      properties:
                        profile:
                          const: MANDATESHIELD_PAYEE_IDENTITY_V1
                        provider:
                          type: string
                          enum:
                          - X402
                          - MPP
                          - STRIPE
                          - CUSTOM
                        merchant_id:
                          type: string
                          minLength: 1
                          maxLength: 240
                        binding:
                          type: object
                        verification:
                          type: object
                          additionalProperties: false
                          required:
                          - method
                          - verifier
                          - evidence_ref
                          properties:
                            method:
                              type: string
                              enum:
                              - TRUSTED_MERCHANT_MAPPING
                              - TLS_SERVICE_ORIGIN
                              - STRIPE_ACCOUNT_CONFIGURATION
                              - HTTPS_WELL_KNOWN
                            verifier:
                              type: string
                              minLength: 1
                              maxLength: 240
                            evidence_ref:
                              type: string
                              minLength: 1
                              maxLength: 2048
                      oneOf:
                      - properties:
                          provider:
                            const: X402
                          binding:
                            type: object
                            additionalProperties: false
                            required:
                            - network
                            - pay_to
                            properties:
                              network:
                                type: string
                                minLength: 1
                                maxLength: 240
                              pay_to:
                                type: string
                                minLength: 1
                                maxLength: 500
                          verification:
                            type: object
                            additionalProperties: false
                            required:
                            - method
                            - verifier
                            - evidence_ref
                            properties:
                              method:
                                const: TRUSTED_MERCHANT_MAPPING
                              verifier:
                                type: string
                                minLength: 1
                                maxLength: 240
                              evidence_ref:
                                type: string
                                minLength: 1
                                maxLength: 2048
                      - properties:
                          provider:
                            const: MPP
                          binding:
                            type: object
                            additionalProperties: false
                            required:
                            - service_origin
                            - method
                            properties:
                              service_origin:
                                type: string
                                pattern: ^https://[^/?#]+$
                              method:
                                type: string
                                pattern: ^[a-z]+$
                          verification:
                            type: object
                            additionalProperties: false
                            required:
                            - method
                            - verifier
                            - evidence_ref
                            properties:
                              method:
                                const: TLS_SERVICE_ORIGIN
                              verifier:
                                type: string
                                minLength: 1
                                maxLength: 240
                              evidence_ref:
                                type: string
                                minLength: 1
                                maxLength: 2048
                      - properties:
                          provider:
                            const: STRIPE
                          binding:
                            type: object
                            additionalProperties: false
                            required:
                            - connected_account_id
                            - merchant_account_id
                            properties:
                              connected_account_id:
                                type: string
                                pattern: ^acct_[A-Za-z0-9_]{8,240}$
                              merchant_account_id:
                                type: string
                                pattern: ^acct_[A-Za-z0-9_]{8,240}$
                          verification:
                            type: object
                            additionalProperties: false
                            required:
                            - method
                            - verifier
                            - evidence_ref
                            properties:
                              method:
                                const: STRIPE_ACCOUNT_CONFIGURATION
                              verifier:
                                type: string
                                minLength: 1
                                maxLength: 240
                              evidence_ref:
                                type: string
                                pattern: ^urn:stripe:connected-account:acct_[A-Za-z0-9_]{8,240}$
                      - properties:
                          provider:
                            const: CUSTOM
                          binding:
                            type: object
                            additionalProperties: false
                            required:
                            - service_origin
                            - provider_id
                            properties:
                              service_origin:
                                type: string
                                pattern: ^https://[^/?#]+$
                              provider_id:
                                type: string
                                minLength: 1
                                maxLength: 240
                          verification:
                            type: object
                            additionalProperties: false
                            required:
                            - method
                            - verifier
                            - evidence_ref
                            properties:
                              method:
                                const: HTTPS_WELL_KNOWN
                              verifier:
                                type: string
                                minLength: 1
                                maxLength: 240
                              evidence_ref:
                                type: string
                                format: uri
                                pattern: ^https://[^/?#]+/\.well-known/mandateshield-payee\.json$
                      description: Versioned canonical payee identity bound into the signed purchase envelope. The model records exact provider identifiers and verification evidence; it does not independently validate an external registry, TLS session, provider account or domain-control document.
                selection:
                  type: object
                  additionalProperties: false
                  properties:
                    index:
                      type: integer
                      minimum: 0
                      maximum: 24
      responses:
        '200':
          description: Syntax normalized into a non-executable purchase envelope
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ProtocolAdapterResult'
        '400':
          $ref: '#/components/responses/BadRequest'
        '413':
          $ref: '#/components/responses/TooLarge'
components:
  schemas:
    Error:
      type: object
      required:
      - error
      properties:
        error:
          type: string
        code:
          type: string
        enforcement_authorized:
          type: boolean
    ProtocolAdapterResult:
      type: object
      additionalProperties: false
      required:
      - adapter
      - adapter_version
      - protocol
      - source_digest
      - envelope_digest
      - envelope
      - bindings
      - assurance
      - next_step
      - warnings
      properties:
        adapter:
          type: string
          enum:
          - AP2_CLOSED_PAYMENT_SD_JWT
          - X402_V2_PAYMENT_REQUIRED
          - MPP_HTTP_PAYMENT_CHALLENGE
        adapter_version:
          const: 1.0.0
        protocol:
          type: string
          enum:
          - AP2
          - X402
          - MPP
        source_digest:
          type: string
          pattern: ^sha256:[a-f0-9]{64}$
        envelope_digest:
          type: string
          pattern: ^sha256:[a-f0-9]{64}$
        envelope:
          $ref: '#/components/schemas/PurchaseEnvelope'
        bindings:
          type: object
          additionalProperties: true
        assurance:
          type: object
          additionalProperties: false
          required:
          - projection_fields_valid
          - source_signature_verified
          - source_trust_verified
          - delegated_authority_verified
          - payment_credential_verified
          - settlement_verified
          - enforcement_authorized
          properties:
            projection_fields_valid:
              const: true
              description: The fields used by the documented MandateShield projection passed adapter validation. This is not full source-protocol conformance.
            source_signature_verified:
              const: false
            source_trust_verified:
              const: false
            delegated_authority_verified:
              const: false
            payment_credential_verified:
              const: false
            settlement_verified:
              const: false
            enforcement_authorized:
              const: false
        next_step:
          type: string
        warnings:
          type: array
          items:
            type: string
    PurchaseEnvelope:
      type: object
      additionalProperties: true
      required:
      - protocol
      - mandate_id
      - agent_id
      - merchant_id
      - amount
      - idempotency_key
      properties:
        protocol:
          type: string
          enum:
          - AP2
          - TAP
          - UCP
          - X402
          - MPP
          - ACP
          - CUSTOM
        mandate_id:
          type: string
          minLength: 1
        agent_id:
          type: string
          minLength: 1
        merchant_id:
          type: string
          minLength: 1
        payee_identity:
          type: object
          additionalProperties: false
          required:
          - profile
          - provider
          - merchant_id
          - binding
          - verification
          properties:
            profile:
              const: MANDATESHIELD_PAYEE_IDENTITY_V1
            provider:
              type: string
              enum:
              - X402
              - MPP
              - STRIPE
              - CUSTOM
            merchant_id:
              type: string
              minLength: 1
              maxLength: 240
            binding:
              type: object
            verification:
              type: object
              additionalProperties: false
              required:
              - method
              - verifier
              - evidence_ref
              properties:
                method:
                  type: string
                  enum:
                  - TRUSTED_MERCHANT_MAPPING
                  - TLS_SERVICE_ORIGIN
                  - STRIPE_ACCOUNT_CONFIGURATION
                  - HTTPS_WELL_KNOWN
                verifier:
                  type: string
                  minLength: 1
                  maxLength: 240
                evidence_ref:
                  type: string
                  minLength: 1
                  maxLength: 2048
          oneOf:
          - properties:
              provider:
                const: X402
              binding:
                type: object
                additionalProperties: false
                required:
                - network
                - pay_to
                properties:
                  network:
                    type: string
                    minLength: 1
                    maxLength: 240
                  pay_to:
                    type: string
                    minLength: 1
                    maxLength: 500
              verification:
                type: object
                additionalProperties: false
                required:
                - method
                - verifier
                - evidence_ref
                properties:
                  method:
                    const: TRUSTED_MERCHANT_MAPPING
                  verifier:
                    type: string
                    minLength: 1
                    maxLength: 240
                  evidence_ref:
                    type: string
                    minLength: 1
                    maxLength: 2048
          - properties:
              provider:
                const: MPP
              binding:
                type: object
                additionalProperties: false
                required:
                - service_origin
                - method
                properties:
                  service_origin:
                    type: string
                    pattern: ^https://[^/?#]+$
                  method:
                    type: string
                    pattern: ^[a-z]+$
              verification:
                type: object
                additionalProperties: false
                required:
                - method
                - verifier
                - evidence_ref
                properties:
                  method:
                    const: TLS_SERVICE_ORIGIN
                  verifier:
                    type: string
                    minLength: 1
                    maxLength: 240
                  evidence_ref:
                    type: string
                    minLength: 1
                    maxLength: 2048
          - properties:
              provider:
                const: STRIPE
              binding:
                type: object
                additionalProperties: false
                required:
                - connected_account_id
                - merchant_account_id
                properties:
                  connected_account_id:
                    type: string
                    pattern: ^acct_[A-Za-z0-9_]{8,240}$
                  merchant_account_id:
                    type: string
                    pattern: ^acct_[A-Za-z0-9_]{8,240}$
              verification:
                type: object
                additionalProperties: false
                required:
                - method
                - verifier
                - evidence_ref
                properties:
                  method:
                    const: STRIPE_ACCOUNT_CONFIGURATION
                  verifier:
                    type: string
                    minLength: 1
                    maxLength: 240
                  evidence_ref:
                    type: string
                    pattern: ^urn:stripe:connected-account:acct_[A-Za-z0-9_]{8,240}$
          - properties:
              provider:
                const: CUSTOM
              binding:
                type: object
                additionalProperties: false
                required:
                - service_origin
                - provider_id
                properties:
                  service_origin:
                    type: string
                    pattern: ^https://[^/?#]+$
                  provider_id:
                    type: string
                    minLength: 1
                    maxLength: 240
              verification:
                type: object
                additionalProperties: false
                required:
                - method
                - verifier
                - evidence_ref
                properties:
                  method:
                    const: HTTPS_WELL_KNOWN
                  verifier:
                    type: string
                    minLength: 1
                    maxLength: 240
                  evidence_ref:
                    type: string
                    format: uri
                    pattern: ^https://[^/?#]+/\.well-known/mandateshield-payee\.json$
          description: Versioned canonical payee identity bound into the signed purchase envelope. The model records exact provider identifiers and verification evidence; it does not independently validate an external registry, TLS session, provider account or domain-control document.
        amount:
          type: object
          additionalProperties: false
          oneOf:
          - required:
            - value
            - currency
          - required:
            - atomic_units
            - asset_decimals
          properties:
            value:
              type: number
              exclusiveMinimum: 0
            minor_units:
              type: integer
              description: Optional exact integer minor-unit amount. Must agree with value.
            currency:
              type: string
              pattern: ^[A-Za-z]{3}$
              description: Current ISO 4217 code with numeric minor units.
            atomic_units:
              type: string
              pattern: ^(?:0|[1-9][0-9]{0,77})$
              description: Exact canonical atomic-asset integer string. It is authoritative for X402 and compared to the registered cap with BigInt semantics; never send a JSON number, decimal, sign or exponent.
            asset_decimals:
              type: integer
              minimum: 0
              maximum: 30
              description: Exact asset exponent from 0 through 30. For X402 it must equal the registered mandate value; it is not inferred from atomic_units.
        limits:
          type: object
          additionalProperties: true
          description: Sandbox analysis policy only. Live v2 ignores caller-supplied limits and injects the active registered mandate.
          properties:
            max_amount:
              type: number
              exclusiveMinimum: 0
              description: Analysis convenience field in major units.
            max_amount_minor:
              type: integer
              exclusiveMinimum: 0
              description: Exact registered production ceiling in currency minor units.
            max_atomic_units:
              type: string
              pattern: ^[1-9][0-9]{0,77}$
              description: Exact positive canonical atomic-unit ceiling. Production obtains this string from the registered mandate and compares it without floating-point conversion.
            asset_decimals:
              type: integer
              minimum: 0
              maximum: 30
              description: Registered atomic-asset exponent; the request must match it exactly.
            currencies:
              type: array
              minItems: 1
              items:
                type: string
                pattern: ^[A-Za-z]{3}$
            merchants:
              type: array
              minItems: 1
              items:
                type: string
                minLength: 1
            assets:
              type: array
              minItems: 1
              items:
                type: string
                minLength: 1
              description: Exact allowed asset identifiers for sandbox analysis.
            networks:
              type: array
              minItems: 1
              items:
                type: string
                minLength: 1
              description: Exact allowed network identifiers for sandbox analysis.
            resources:
              type: array
              minItems: 1
              items:
                type: string
                minLength: 1
              description: Exact allowed paid-resource identifiers for sandbox analysis.
          oneOf:
          - required:
            - currencies
            - merchants
            anyOf:
            - required:
              - max_amount_minor
            - required:
              - max_amount
          - required:
            - max_atomic_units
            - asset_decimals
            - assets
            - networks
            - resources
            - merchants
        asset_id:
          type: string
          minLength: 1
          description: Exact token or asset identifier. Required for X402 and matched byte-for-byte to the registered mandate after surrounding whitespace is removed.
        network:
          type: string
          minLength: 1
          description: Exact network or chain identifier. Required for X402 and matched to the registered mandate.
        resource:
          type: string
          minLength: 1
          description: Exact paid-resource identifier. Required for X402 and matched to the registered mandate; a different path or resource is a substitution.
        http_request:
          type: object
          additionalProperties: false
          required:
          - profile
          - url
          - method
          - body_sha256
          - headers_sha256
          - redirect_policy
          properties:
            profile:
              const: MANDATESHIELD_X402_V2_EXACT_EIP3009_V1
            url:
              type: string
              format: uri
            method:
              type: string
              enum:
              - GET
              - HEAD
              - POST
              - PUT
              - PATCH
              - DELETE
            body_sha256:
              type: string
              pattern: ^sha256:[a-f0-9]{64}$
            headers_sha256:
              type: string
              pattern: ^sha256:[a-f0-9]{64}$
            redirect_policy:
              const: ERROR
          description: Optional signed HTTP action projection used by the narrow first-party x402 v2 exact/EIP-3009 Gate adapter.
        created_at:
          type: string
          format: date-time
        expires_at:
          type: string
          format: date-time
        idempotency_key:
          type: string
          minLength: 1
          maxLength: 256
          pattern: ^[A-Za-z0-9._:~-]+$
        intent_hash:
          type: string
        checkout_hash:
          type: string
          minLength: 1
          description: Digest or stable identifier for the exact final checkout. Required by the strict AP2 closed-payment projection.
        user_consent:
          type: boolean
        credential_binding:
          type: string
        purpose:
          type: string
      description: Normalized purchase facts for policy and authority verification. For X402 this is a pre-payment verification projection, not an x402 challenge, signed payment payload, facilitator submission or settlement instruction.
      allOf:
      - if:
          properties:
            protocol:
              const: X402
          required:
          - protocol
        then:
          required:
          - asset_id
          - network
          - resource
          properties:
            amount:
              required:
              - atomic_units
              - asset_decimals
  responses:
    TooLarge:
      description: Request exceeds the endpoint size limit
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Invalid JSON, shape or parameter
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    hostingSession:
      type: apiKey
      in: header
      name: OAI-Authenticated-User-Email
      description: Hosting-injected authenticated account-owner identity. The hosting boundary validates the user session and injects this assertion; callers cannot authenticate by supplying this header directly. State-changing control-plane requests additionally require the trusted same-origin check documented by the operation.
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: ms_test_… or ms_live_…
      description: Keep API keys server-side and isolate them by purpose. VERIFY keys can issue challenges and strict decisions. Paid live PROCESSOR keys are bound to one processor_audience and can call only the execution-transition boundary.
x-mandateshield-release:
  product_version: 1.13.0
  openapi_version: 3.4.0
  standard_version: 2.4.0
  released_at: '2026-07-28T14:25:22.000Z'
  generated_at: '2026-07-28T14:25:22.000Z'
  status: current
  latest_pointer: https://mandateshield.com/current-release.json
  superseded_by: null
  canonical_versioned_documents:
    openapi: https://mandateshield.com/openapi/3.4.0.json
    llms: https://mandateshield.com/llms/1.13.0.txt
    llms_full: https://mandateshield.com/llms-full/1.13.0.txt
    discovery: https://mandateshield.com/discovery/1.13.0.json