refactor: replace mempool internal API with a more generic config API

lnbits/extensions/satspay/crud.py

@@ -6,7 +6,7 @@ from lnbits.core.services import create_invoice
 from lnbits.core.views.api import api_payment
 from lnbits.helpers import urlsafe_short_hash
 
-from ..watchonly.crud import get_fresh_address, get_mempool, get_watch_wallet
+from ..watchonly.crud import get_fresh_address, get_config, get_watch_wallet
 
 # from lnbits.db import open_ext_db
 from . import db
@@ -18,7 +18,6 @@ from .models import Charges, CreateCharge
 async def create_charge(user: str, data: CreateCharge) -> Charges:
     charge_id = urlsafe_short_hash()
     if data.onchainwallet:
-        wallet = await get_watch_wallet(data.onchainwallet)
         onchain = await get_fresh_address(data.onchainwallet)
         onchainaddress = onchain.address
     else:
@@ -102,11 +101,11 @@ async def check_address_balance(charge_id: str) -> List[Charges]:
     charge = await get_charge(charge_id)
     if not charge.paid:
         if charge.onchainaddress:
-            mempool = await get_mempool(charge.user)
+            config = await get_config(charge.user)
             try:
                 async with httpx.AsyncClient() as client:
                     r = await client.get(
-                        mempool.endpoint + "/api/address/" + charge.onchainaddress
+                        config.mempool_endpoint + "/api/address/" + charge.onchainaddress
                     )
                     respAmount = r.json()["chain_stats"]["funded_txo_sum"]
                     if respAmount >= charge.balance: