Lisa Streeter: Setting Order Number before Payment Transaction

The Goal

In Drupal Commerce, carts do not have order numbers. Order numbers are not set until checkout completion, when the order is placed. If the order type has been configured with a number pattern, that pattern is used to generate the order number; otherwise the order entity ID is used. As a result, when a credit card payment is added during checkout, the cart/order may not have its final Order Number yet. For some payment gateways, this is fine--only the order entity ID is needed.