Attentive Identity API
Use the Identity API to manage user identifiers. With this API, you can programmatically add a client user identifier or custom identifier(s) to a user. You should only use clientUserId and customIdentifiers to send Attentive your system-assigned unique identifiers (even when testing). Notes: - Sending duplicate values could lead to unintentionally bridging users together. - Don't use customIdentifiers to send attributes (e.g., first name, last name). To send those types of attributes, use our [Custom Attributes API](https://docs.attentivemobile.com/openapi/reference/tag/Custom-Attributes/). - Avoid sending null values or empty strings. If you don't have a valid identifier, you should omit the field from the payload.