# Update a profile (identify by customId)

- Operation ID: `UpdateAClientByCustomId`
- HTTP method: `POST`
- Path: `/v4/clients/by-customid/{customId}`
- Sanitized category OpenAPI YAML: <https://hub.synerise.com/api-reference/profile-management.yaml>
- [Human-readable API reference](https://hub.synerise.com/api-reference/profile-management#operation/UpdateAClientByCustomId)

## Locate this method

Fetch the sanitized category YAML, then read `paths["/v4/clients/by-customid/{customId}"]["post"]`. Confirm that its `operationId` is `UpdateAClientByCustomId`. That operation contains the full parameters, request body, responses, schemas, and examples.