post https://stage.check21.com/c2/api/customer
The POST Customer Endpoint is, in most cases, the first endpoint utilized in the initial transaction submission workflow. This allows clients to store customer contact data within the Check21.com Gateway. The Customer is the parent record of Customer Accounts, Recurring records, and Transactions. As a response to a Customer submission, Check21.com replies with a Customer ID which can be stored within the Clients platform and submitted in lieu of full customer data.