# Credentials

## Access Token Exchange

 - [POST /credentials/accesstoken](https://docs.shift4.com/apis/payments-platform-rest/openapi/credentials/accesstokenexchange.md): This function is used to request exchanging a Client GUID and Auth Token for an Access Token.

Integration Methods:
- Host Direct
- Locally Installed UTG
- Commerce Engine For On Premise
- Commerce Engine For Cloud

See the Integration Methods and URLs Section sections of the Development Quick Start guide for details regarding each processing option.