Method Financial Merchants API
Merchant directory
Method Financial Merchants API is one of 42 APIs that Method Financial publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Merchants. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.
This API exposes 2 operations across 2 paths, and defines 9 schemas. It is described by OpenAPI 3.2.0, at version 2026-03-30.
Requests are made against 3 base URLs: https://production.methodfi.com, https://sandbox.methodfi.com, https://dev.methodfi.com.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 2
Method Financial Merchants API declares
2 security schemes
for authenticating requests.
It accepts HTTP bearer tokens (OpalToken).
It accepts HTTP bearer tokens (SecretKey).
By default, every request must be authenticated.
OpalToken— 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— Secret key authentication. Use your team's secret key (sk...) as the Bearer token. All authenticated API endpoints require this scheme unless otherwise noted.
Paths & Operations 2
Across 2 paths, the API surfaces 2 operations — 2 GET. Each is listed below with its method, path, parameters, and response codes.
Merchant directory
Schemas 9
The contract defines 9 schemas that model the data the API accepts and returns. The most detailed are Merchant (8 properties), MerchantProviderIds (5 properties), ErrorObject (4 properties), ErrorEnvelope (3 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from Method Financial 12
Other APIs Method Financial publishes across the network.
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