diff --git a/models.py b/models.py
index 0df1de9..07dbe2d 100644
--- a/models.py
+++ b/models.py
@@ -62,6 +62,8 @@ class DeleteNWC(BaseModel):
 
 
 class OnInvoicePaid(BaseModel):
+    class Config:
+        arbitrary_types_allowed = True
     sp: NWCServiceProvider
     pubkey: str
     payload: Dict