Velo Payments APIs

First obtain your Velo-issued API key and API secret from Velo Development Center. Base64-encode `<api_key>:<api_secret> and send it in the Authorization: Basic ... header to POST https://api.sandbox.velopayments.com/v1/authenticate?grant_type=client_credentials (or the production host) as documented in [Velo API docs](https://apidocs.velopayments.com/). The response returns an access_token; send that token as Authorization: Bearer <access_token>` on subsequent API requests.

Request Sandbox or production access from Velo Development Center. Velo backoffice staff add your organization as a payor, then create and securely share your payor ID, API key, and API secret. Use the API key and API secret together as HTTP Basic credentials to call POST /v1/authenticate?grant_type=client_credentials and obtain a bearer access token for API calls.