# Biller ## Retrieves a biller - [GET /biller](https://developer.adfin.com/products/direct-integration/direct-integration-api-reference/biller/getbiller.md): Fetches the details of the authenticated user's associated biller. Returns a 404 if no biller is found. ## Patch a Biller - [PATCH /biller](https://developer.adfin.com/products/direct-integration/direct-integration-api-reference/biller/patchbiller.md): Applies JSON Patch operations to update specific biller fields.