patch https://api.loopcrypto.xyz/api/v2/customer/
Updates an existing customer in the system. The only field that can currently be modified is the customer reference ID (customerRefId), which is an optional external identifier used to link the customer to an external system. If provided, the customerRefId will be updated to the new value. If null is provided, the existing customerRefId will be removed. All other customer fields will remain unchanged.