Register User

Creates a customer account and queues welcome/account-confirmation emails.

Required body fields: firstName, lastName, email, password, phone, newsletter.

Response fields: message confirms account creation. Login separately to receive a token.

Possible errors:

• 409: Email already exists - another customer already uses the email.
• 409: Phone number already exists - another customer already uses the phone number.
• 400: Validation error - invalid email, phone, password, role, or required signup field.
• 400: Missing One or More Required Parameters - required body/query fields were not supplied.
• 403: Access denied - gateway traffic guard/rate policy blocked the request.
• 429: Too many requests - gateway rate limit exceeded.
• 500: Unexpected Error - unhandled gateway or downstream service failure.