diff --git a/graphql/schemas/operations.graphql b/graphql/schemas/operations.graphql
index 64fca0b..fe6e85d 100644
--- a/graphql/schemas/operations.graphql
+++ b/graphql/schemas/operations.graphql
@@ -165,7 +165,7 @@ mutation AssignLightningAddress {
   }
 }
 
-mutation SubmitLnurlPayInvoice($id: String!, $invoice: String!) {
+mutation SubmitLnurlPayInvoice($id: String!, $invoice: String) {
   submit_lnurl_pay_invoice(id: $id, invoice: $invoice)
 }
 
diff --git a/graphql/schemas/schema_wallet_read.graphql b/graphql/schemas/schema_wallet_read.graphql
index 5543101..3f143e6 100644
--- a/graphql/schemas/schema_wallet_read.graphql
+++ b/graphql/schemas/schema_wallet_read.graphql
@@ -738,7 +738,7 @@ type mutation_root {
   start_prepared_session_v2(challenge: String!, challengeSignature: String!, challengeSignatureType: ChallengeSignatureType, preparedPermissionToken: String!): SessionPermit
   start_session(authPubKey: String!, challenge: String!, challengeSignature: String!, challengeSignatureType: ChallengeSignatureType, signedAuthPubKey: String!, walletPubKey: String!): TokenContainer
   start_session_v2(authPubKey: String!, challenge: String!, challengeSignature: String!, challengeSignatureType: ChallengeSignatureType, signedAuthPubKey: String!, walletPubKey: String!): SessionPermit
-  submit_lnurl_pay_invoice(id: String!, invoice: String!): Void
+  submit_lnurl_pay_invoice(id: String!, invoice: String): Void
 }
 
 scalar numeric
diff --git a/pigeon/src/lib.rs b/pigeon/src/lib.rs
index 803b1b4..dc9d80e 100644
--- a/pigeon/src/lib.rs
+++ b/pigeon/src/lib.rs
@@ -31,7 +31,7 @@ pub async fn submit_lnurl_pay_invoice(
     backend_url: &str,
     auth: &Auth,
     id: String,
-    invoice: String,
+    invoice: Option<String>,
 ) -> graphql::Result<()> {
     let token = auth.query_token().await?;
     let client = build_async_client(Some(&token))?;
diff --git a/pigeon/tests/integration_tests.rs b/pigeon/tests/integration_tests.rs
index 1c848b2..ccd9c32 100644
--- a/pigeon/tests/integration_tests.rs
+++ b/pigeon/tests/integration_tests.rs
@@ -40,7 +40,16 @@ async fn test_submit_lnurl_pay_invoice() {
         &backend_url,
         &auth,
         "5fab1a65-3486-4dfd-bba8-dad2c1a1b98e".to_string(),
-        "invoice".to_string(),
+        Some("invoice".to_string()),
+    )
+    .await
+    .unwrap();
+
+    submit_lnurl_pay_invoice(
+        &backend_url,
+        &auth,
+        "44872a5a-8be9-4a27-a80f-2ec66ff1f5b6".to_string(),
+        None,
     )
     .await
     .unwrap();