fix: Add Breez SDK trampoline payments support (lnbits#2905)

* fix: add support for trampoline payments in Breez integration

- Introduced `BREEZ_USE_TRAMPOLINE` configuration in `.env.example`.
- Updated `BreezSdkFundingSource` to include `breez_use_trampoline` setting.
- Modified payment request in `breez.py` to utilize the trampoline setting when sending payments.

* Update .env.example

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

* Update lnbits/settings.py

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

* refactor: streamline payment request formatting in Breez integration

---------

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

.env.example

@@ -133,6 +133,8 @@ BREEZ_GREENLIGHT_SEED=SEED
 BREEZ_GREENLIGHT_INVITE_CODE=CODE
 BREEZ_GREENLIGHT_DEVICE_KEY="/path/to/breezsdk/device.pem"  # or BASE64/HEXSTRING
 BREEZ_GREENLIGHT_DEVICE_CERT="/path/to/breezsdk/device.crt"  # or BASE64/HEXSTRING
+# BREEZ_USE_TRAMPOLINE=true
+
 
 ######################################
 ####### Auth Configurations ##########

lnbits/settings.py

@@ -511,6 +511,7 @@ class BreezSdkFundingSource(LNbitsSettings):
     breez_greenlight_invite_code: Optional[str] = Field(default=None)
     breez_greenlight_device_key: Optional[str] = Field(default=None)
     breez_greenlight_device_cert: Optional[str] = Field(default=None)
+    breez_use_trampoline: bool = Field(default=True)
 
 
 class BoltzFundingSource(LNbitsSettings):

lnbits/wallets/breez.py

@@ -198,7 +198,9 @@ async def pay_invoice(
             invoice = lnbits_bolt11.decode(bolt11)
 
             try:
-                send_payment_request = breez_sdk.SendPaymentRequest(bolt11=bolt11)
+                send_payment_request = breez_sdk.SendPaymentRequest(
+                    bolt11=bolt11, use_trampoline=settings.breez_use_trampoline
+                )
                 send_payment_response: breez_sdk.SendPaymentResponse = (
                     self.sdk_services.send_payment(send_payment_request)
                 )