(optional) The Stellar account ID used to identify this customer. If many customers share the same Stellar account, the memo and memo_type parameters should be included as well.
(optional) The ID of the customer as returned in the response of a previous PUT request. If the customer has not been registered, they do not yet have an id.
(optional) a properly formatted memo that uniquely identifies a customer. This value is generated by the client making the request. This parameter and memo_type are identical to the PUT request parameters of the same name.