[feat]: invoice amount settings (#2990)

lnbits/core/services/payments.py

@@ -120,6 +120,12 @@ async def create_invoice(
         amount, user_wallet, currency, extra
     )
 
+    if amount_sat > settings.lnbits_max_incoming_payment_amount_sats:
+        raise InvoiceError(
+            f"Invoice amount {amount_sat} sats is too high. Max allowed: "
+            f"{settings.lnbits_max_incoming_payment_amount_sats} sats.",
+            status="failed",
+        )
     if settings.is_wallet_max_balance_exceeded(
         user_wallet.balance_msat / 1000 + amount_sat
     ):
@@ -707,8 +713,14 @@ def _validate_payment_request(
     if not invoice.amount_msat or not invoice.amount_msat > 0:
         raise PaymentError("Amountless invoices not supported.", status="failed")
 
-    if max_sat and invoice.amount_msat > max_sat * 1000:
-        raise PaymentError("Amount in invoice is too high.", status="failed")
+    max_sat = max_sat or settings.lnbits_max_outgoing_payment_amount_sats
+    max_sat = min(max_sat, settings.lnbits_max_outgoing_payment_amount_sats)
+    if invoice.amount_msat > max_sat * 1000:
+        raise PaymentError(
+            f"Invoice amount {invoice.amount_msat // 1000} sats is too high. "
+            f"Max allowed: {max_sat} sats.",
+            status="failed",
+        )
 
     return invoice