Changes to Generate an authentication token for a customer

added the pattern ^ctm_[a-z\d]{26}$ to the path request parameter customer_id

added the new path request parameter customer_id

the data/expires_at response's property type changed from string to no type, and format from date-time to no format for status 200

added Timestamp to the data/expires_at response property allOf list for the response status 200

the response property data/expires_at became required for the status 200

endpoint added