OpenAPI Specification
openapi: 3.1.0
info:
title: Method Account Attributes Card Products 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: Card Products
description: Card product definitions
paths:
/card_products/{product_id}:
get:
operationId: retrieveCardProduct
summary: Retrieve a card product
description: Returns a single card product by its identifier. Card products describe specific card programs from networks and issuers.
tags:
- Card Products
security:
- SecretKey: []
parameters:
- $ref: '#/components/parameters/method_version'
- name: product_id
in: path
required: true
description: Unique identifier for the card product.
schema:
type: string
responses:
'200':
description: The requested card product.
content:
application/json:
schema:
$ref: '#/components/schemas/CardProductResponse'
'400':
$ref: '#/components/responses/BadRequest'
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
'429':
$ref: '#/components/responses/RateLimited'
'500':
$ref: '#/components/responses/InternalError'
components:
responses:
InternalError:
description: Internal server error.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
RateLimited:
description: Too many requests - rate limit exceeded.
headers:
Retry-After:
description: Number of seconds to wait before retrying.
schema:
type: integer
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
NotFound:
description: Not found - the requested resource does not exist.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
Unauthorized:
description: Unauthorized - missing or invalid authentication token.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
BadRequest:
description: Bad request - invalid parameters or request body.
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorEnvelope'
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.
CardProduct:
type: object
description: A Card Product represents a specific card program from a network and issuer.
required:
- id
- network
- issuer
- name
- type
- created_at
- updated_at
properties:
id:
type: string
description: Unique identifier for the card product.
example: cprd_mJ3Kvx6G7hBR4
network:
type:
- string
- 'null'
description: Card network (e.g., Visa, Mastercard).
issuer:
type:
- string
- 'null'
description: Card issuing institution.
name:
type:
- string
- 'null'
description: Display name of the card product.
type:
type:
- string
- 'null'
description: The card product type.
enum:
- specific
- generic
- in_review
- null
brands:
type:
- array
- 'null'
description: Array of brand entries for this card product.
items:
type: object
properties:
id:
type: string
description: Unique identifier for the brand.
description:
type: string
description: Description of the brand.
network:
type: string
description: Card network for this brand.
network_tier:
type: string
description: Network tier for this brand.
default_image:
type: string
description: URL of the default image for this brand.
error:
$ref: '#/components/schemas/ResourceError'
created_at:
type: string
format: date-time
description: Timestamp when the card product was created.
updated_at:
type: string
format: date-time
description: Timestamp when the card product was last updated.
CardProductResponse:
allOf:
- $ref: '#/components/schemas/SuccessEnvelope'
- type: object
properties:
data:
$ref: '#/components/schemas/CardProduct'
ResourceError:
type:
- object
- 'null'
required:
- type
- code
- message
properties:
type:
type: string
code:
type: integer
sub_type:
type:
- string
- 'null'
message:
type: string
ErrorEnvelope:
type: object
required:
- success
- data
- message
properties:
success:
type: boolean
description: Always `false` for error responses.
data:
type: object
required:
- error
properties:
error:
$ref: '#/components/schemas/ErrorObject'
message:
type: string
SuccessEnvelope:
type: object
description: Standard envelope for successful responses that return a single payload.
required:
- success
- data
- message
properties:
success:
type: boolean
description: Always `true` for successful responses.
data:
description: Operation-specific response payload.
message:
type:
- string
- 'null'
example:
success: true
data: {}
message: null
parameters:
method_version:
name: Method-Version
in: header
required: true
description: 'API version to use for this request. This spec targets `2025-12-01`.
The SDK sets this header automatically.
'
schema:
type: string
enum:
- '2025-12-01'
default: '2025-12-01'
securitySchemes:
OpalToken:
type: http
scheme: bearer
description: 'Opal token authentication for Opal session endpoints. Use an Opal token (`otkn_...`)
as the Bearer token. Created via POST /opal/token using a secret key.
'
SecretKey:
type: http
scheme: bearer
description: 'Secret key authentication. Use your team''s secret key (`sk_...`) as the Bearer token.
All authenticated API endpoints require this scheme unless otherwise noted.
'