refactor: unify responses in backend wallets

lnbits/wallets/base.py

@@ -0,0 +1,32 @@
+from abc import ABC, abstractmethod
+from requests import Response
+from typing import NamedTuple, Optional
+
+
+class InvoiceResponse(NamedTuple):
+    raw_response: Response
+    payment_hash: Optional[str] = None
+    payment_request: Optional[str] = None
+
+
+class TxStatus(NamedTuple):
+    raw_response: Response
+    settled: Optional[bool] = None
+
+
+class Wallet(ABC):
+    @abstractmethod
+    def create_invoice(self, amount: int, memo: str = "") -> InvoiceResponse:
+        pass
+
+    @abstractmethod
+    def pay_invoice(self, bolt11: str) -> Response:
+        pass
+
+    @abstractmethod
+    def get_invoice_status(self, payment_hash: str, wait: bool = True) -> TxStatus:
+        pass
+
+    @abstractmethod
+    def get_payment_status(self, payment_hash: str) -> TxStatus:
+        pass