webirr library Null safety

Classes

ApiResponse<T>
Bill
Bill or Invoice object issued to a customer it is basically a customer name and amount in ETB.
Payment
Payment object returned from getPaymentStatus api call
PaymentDetail
Payment Detail such as Bank Id, Bank Reference Number
WeBirrClient
A WeBirrClient instance object can be used to Create, Update or Delete a Bill at WeBirr Servers and also to Get the Payment Status of a bill. It is a wrapper for the REST Web Service API.