POST request to the /api/gifts/gift endpoint.orderId: The order ID of for your own reference. This is a required field of type string.senderEmail: The email address of the sender. This is a required field of type string.sender: The name of the sender. This is an optional field of type string.amount: The amount of the gift card. This is a required field of type number.currency: The currency of the gift card. This is a required field of type string. The currency should be in ISO 4217 format.