Handle signature issues

During the payment flow, issues can arise with the customer signature. Example: The signature may not match that on the identification provided by the customer.

When the signature is collected on the Clover device, the POS should display the signature and give the merchant the option to accept or reject it.

• If the POS doesn't take any action when the payment response is returned, the signature is accepted by default.

• If the merchant rejects the signature, the POS must initiate a separate request (v1/payments/{paymentId}/void) to void the payment.