get:
  tags: [Payments]
  summary: List available FX currencies
  description: |
    Returns the BFF startup-cached Treasury Currency Catalog projection for
    client-visible FX currencies. `decimals`, `scale`, and `displayScale` are
    presentation fields backed by Treasury `display_scale`.
    `accountingScaleCandidate` is informational only and must not be used by
    clients to determine executable payout precision, quote precision, or
    guaranteed provider support.
    The endpoint is authenticated and authorized by `organizations_ref`, but the
    returned catalogue is global rather than organization-customized. If Treasury
    was unavailable at BFF startup while this endpoint was enabled, BFF fails
    startup; if Treasury becomes unavailable after startup, BFF continues serving
    the cached catalog revision.
  operationId: paymentsFXCurrencies
  security:
    - bearerAuth: []
  parameters:
    - $ref: ../parameters/organizations_ref.yaml#/components/parameters/OrganizationsRef
  responses:
    '200':
      description: FX currency catalogue projected from Treasury
      content:
        application/json:
          schema:
            allOf:
              - $ref: ../response/response.yaml#/components/schemas/BaseResponse
              - type: object
                properties:
                  data:
                    $ref: ./response/payment.yaml#/components/schemas/FXCurrenciesData
    '400':
      $ref: ../response/operation.yaml#/components/responses/BadRequest
    '401':
      $ref: ../response/operation.yaml#/components/responses/Unauthorized
    '403':
      $ref: ../response/operation.yaml#/components/responses/Forbidden
    '503':
      $ref: ../response/operation.yaml#/components/responses/ServiceUnavailable