> For the complete documentation index, see [llms.txt](https://docs.alternativepayments.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.alternativepayments.io/api-reference/oauth.md).

# OAuth

## Get OAuth2 access token

> OAuth2 client credentials flow endpoint. Generate a new access token using client credentials. The "client\_id" (username) and "client\_secret" (password) must be passed as Basic Auth credentials. Ex: Authorization: Basic Base64Encode(client\_id:client\_secret). The returned access token should be used as Bearer token for subsequent API calls: Authorization: Bearer {access\_token}

```json
{"openapi":"3.1.1","info":{"title":"Alternative Payments","version":"1.1.0"},"servers":[{"url":"http://public-api.alternativepayments.io"}],"security":[{"BasicAuth":[]}],"components":{"securitySchemes":{"BasicAuth":{"type":"http","scheme":"basic"}},"schemas":{"TokenResponse":{"description":"OAuth2 access token response structure containing the bearer token and expiration details","properties":{"access_token":{"description":"@Description The OAuth2 access token for API authentication - use as Bearer token in Authorization header\n@Example 580defdbe1d21e0001c67e5c2a0a6c98ba8b4a059dc5825388501574","type":"string"},"expires_in":{"description":"@Description Token expiration time in seconds from issuance\n@Example 3600","type":"integer"},"token_type":{"description":"@Description OAuth2 token type - always \"bearer\" for this implementation\n@Example bearer","type":"string"}},"type":"object"}}},"paths":{"/oauth/token":{"post":{"description":"OAuth2 client credentials flow endpoint. Generate a new access token using client credentials. The \"client_id\" (username) and \"client_secret\" (password) must be passed as Basic Auth credentials. Ex: Authorization: Basic Base64Encode(client_id:client_secret). The returned access token should be used as Bearer token for subsequent API calls: Authorization: Bearer {access_token}","operationId":"createOAuthToken","responses":{"200":{"description":"Successfully generated OAuth2 access token","content":{"application/json":{"schema":{"$ref":"#/components/schemas/TokenResponse"}}}},"403":{"description":"Invalid credentials","content":{"application/json":{"schema":{"additionalProperties":{"type":"string"},"type":"object"}}}}},"summary":"Get OAuth2 access token","tags":["OAuth"],"requestBody":{"content":{"application/x-www-form-urlencoded":{"schema":{"type":"object","properties":{"grant_type":{"type":"string","description":"OAuth2 grant type - must be 'client_credentials'"}},"required":["grant_type"]}}}}}}}}
```


---

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