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The TPP Onboarding API facilitates onboarding a TPP to each LFI they choose to integrate with. It is called once per LFI, prior to submitting the first request to a given LFI instance on the Open Finance Platform (OFP), which makes a backend call to the Open Finance Trust Framework (OFTF).

Once completed, a given TPP can then call the LFIs instance as per the standard API Flows described in each functional area.

1. API Flows

1.1 Invoke Onboarding Operation

The flow MUST begin with a TPP who has a client certificate signed by the OFTF for the purposes of providing client authentication for transport layer security.

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• Validate the presented client certificate and verify it is valid and signed by the OFTF.

• Reject the connection attempt if the client certificate presented by the TPP cannot be validated.

• Introspect the certificate to retrieve the TPP ID and Software Statement ID from the relevant assertions encoded on the certificate.

• Call the Onboarding Operation at the OFTF to complete onboarding the TPP.

• Return a 204 No Content response to the TPP to indicate that onboarding has been completed successfully.

• Return an appropriate HTTP status code and optionally an error object if the request cannot be completed.

2. TPP Onboarding Examples

The following are non-normative examples of invoking the TPP Onboarding operation.

2.1 Invoke TPP Onboarding Operation

2.1.1 Request: TPP to LFI Onboarding Instance at OFP

POST /open-finance/onboarding/v1.0-rc2/tpp-registration
x-fapi-interaction-id: ecd4f69f-b1ea-4589-afe9-71e63416bb6f

2.1.2 Response: Onboarding Operation Successful

HTTP/1.1 204 No Content
Cache-Control: no-cache, no-store
x-fapi-interaction-id: ecd4f69f-b1ea-4589-afe9-71e63416bb6f

3. OpenAPI Description

The TPP Onboarding OpenAPI Description is shown below.

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openapi: 3.1.0
info:
  title: UAE Onboarding API
  description: '## UAE Open Finance Onboarding API Specification'
  version: v1.0-rc2
tags:
  - name: TPP Onboarding
    description: Onboard a TPP at the OFP for a given LFI
paths:
  /tpp-registration:
    post:
      tags:
        - TPP Onboarding
      operationId: TppOnboarding_create
      summary: Onboard a TPP with a given LFI
      description: >-
        Allows a TPP to onboard with a given LFI. This is a one-off operation
        that is invoked the first time a TPP accesses the LFI.


        An empty request body is submitted to the operation. The OFP will
        introspect the TPP client certificate to extract the TPP ID, and use
        this to complete onboarding at the Trust Framework.


        Once the operation is complete the TPP will be able to call the LFI
        APIs.
      parameters:
        - $ref: '#/components/parameters/x-fapi-interaction-id'
      responses:
        '204':
          description: The onboarding operation completed successfully
          headers:
            x-fapi-interaction-id:
              required: false
              description: An RFC4122 UID used as a correlation id.
              schema:
                type: string
        default:
          description: >-
            An unexpected error response, optionally including a response
            payload depending on the HTTP return code
          headers:
            x-fapi-interaction-id:
              required: true
              description: An RFC4122 UID used as a correlation id.
              schema:
                type: string
          content:
            application/json; charset=utf-8:
              schema:
                $ref: '#/components/schemas/DefaultError'
            application/json:
              schema:
                $ref: '#/components/schemas/DefaultError'
      security:
        - MutualTLS: []
components:
  parameters:
    x-fapi-interaction-id:
      name: x-fapi-interaction-id
      in: header
      required: false
      description: An RFC4122 UID used as a correlation id.
      schema:
        type: string
  schemas:
    AEError:
      type: object
      required:
        - Code
        - Message
      properties:
        Code:
          allOf:
            - $ref: '#/components/schemas/AEErrorCode'
          description: Low level textual error code, e.g., UAEOF.Field.Missing
        Message:
          type: string
          minLength: 1
          maxLength: 500
          description: >-
            A description of the error that occurred. e.g., 'A mandatory field
            isn't supplied' or 'RequestedExecutionDateTime must be in future'

            UAEOF doesn't standardise this field
        Path:
          type: string
          minLength: 1
          maxLength: 500
          description: >-
            Recommended but optional reference to the JSON Path of the field
            with error, e.g., Data.Initiation.InstructedAmount.Currency
        Url:
          type: string
          description: >-
            URL to help remediate the problem, or provide more information, or
            to API Reference, or help etc
      description: Error
    AEErrorCode:
      type: string
      enum:
        - AccessToken.Unauthorized
        - AccessToken.InvalidScope
        - Consent.Revoked
        - Consent.TransientAccountAccessFailure
        - Consent.AccountTemporarilyBlocked
        - Consent.PermanentAccountAccessFailure
        - Consent.Invalid
        - JWS.InvalidSignature
        - JWS.Malformed
        - JWS.InvalidClaim
        - JWS.InvalidHeader
        - GenericRecoverableError
        - GenericError
        - JWE.DecryptionError
        - JWE.InvalidHeader
        - Event.UnexpectedEvent
        - Body.InvalidFormat
        - Resource.InvalidResourceId
        - Resource.InvalidFormat
        - Consent.BusinessRuleViolation
    DefaultError:
      type: object
      properties:
        Errors:
          type: array
          items:
            $ref: '#/components/schemas/AEError'
          minItems: 1
  securitySchemes:
    MutualTLS:
      description: >-
        Operation requires Mutual TLS for client authentication. Note connecting
        using MTLS does not preclude other security mechanisms such as
        certificate-bound access tokens.
      type: mutualTLS
servers:
  - url: /open-finance/onboarding/v1.0-rc2

4. Attachments

The TPP Onboarding OpenAPI description is attached.

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See the TPP Onboarding API - OpenAPI Description page.