updateContact( )

Updates a contact.

Each time the contact is updated, revision increments by 1. The existing revision must be included when updating the contact. This ensures you're working with the latest contact information, and it prevents unintended overwrites.

You can't call Update Contact to update the primaryEmail of a contact who is also a member. Instead, use the Members API to update the member's login email, which will also update the contact's primary email.

Members are typically linked to contacts, and while they share a relationship, the member ID and contact ID are distinct identifiers. Make sure to specify the contact ID when calling Update Contact.