diff --git a/tests/extensions/bleskomat/test_lnurl_api.py b/tests/extensions/bleskomat/test_lnurl_api.py
index 969550cdc..2e018dcdb 100644
--- a/tests/extensions/bleskomat/test_lnurl_api.py
+++ b/tests/extensions/bleskomat/test_lnurl_api.py
@@ -9,18 +9,21 @@ from tests.helpers import credit_wallet
 from tests.extensions.bleskomat.conftest import bleskomat, lnurl
 from tests.mocks import WALLET
 
+
 @pytest.mark.asyncio
 async def test_bleskomat_lnurl_api_missing_secret(client):
     response = await client.get("/bleskomat/u")
     assert response.status_code == 200
     assert response.json() == {"status": "ERROR", "reason": "Missing secret"}
 
+
 @pytest.mark.asyncio
 async def test_bleskomat_lnurl_api_invalid_secret(client):
     response = await client.get("/bleskomat/u?k1=invalid-secret")
     assert response.status_code == 200
     assert response.json() == {"status": "ERROR", "reason": "Invalid secret"}
 
+
 @pytest.mark.asyncio
 async def test_bleskomat_lnurl_api_unknown_api_key(client):
     query = {
@@ -33,11 +36,12 @@ async def test_bleskomat_lnurl_api_unknown_api_key(client):
         "f": "EUR",
     }
     payload = query_to_signing_payload(query)
-    signature = "xxx"# not checked, so doesn't matter
-    response = await client.get(f'/bleskomat/u?{payload}&signature={signature}')
+    signature = "xxx"  # not checked, so doesn't matter
+    response = await client.get(f"/bleskomat/u?{payload}&signature={signature}")
     assert response.status_code == 200
     assert response.json() == {"status": "ERROR", "reason": "Unknown API key"}
 
+
 @pytest.mark.asyncio
 async def test_bleskomat_lnurl_api_invalid_signature(client, bleskomat):
     query = {
@@ -51,10 +55,11 @@ async def test_bleskomat_lnurl_api_invalid_signature(client, bleskomat):
     }
     payload = query_to_signing_payload(query)
     signature = "invalid"
-    response = await client.get(f'/bleskomat/u?{payload}&signature={signature}')
+    response = await client.get(f"/bleskomat/u?{payload}&signature={signature}")
     assert response.status_code == 200
     assert response.json() == {"status": "ERROR", "reason": "Invalid API key signature"}
 
+
 @pytest.mark.asyncio
 async def test_bleskomat_lnurl_api_valid_signature(client, bleskomat):
     query = {
@@ -64,41 +69,42 @@ async def test_bleskomat_lnurl_api_valid_signature(client, bleskomat):
         "minWithdrawable": "1",
         "maxWithdrawable": "1",
         "defaultDescription": "test valid sig",
-        "f": "EUR",# tests use the dummy exchange rate provider
+        "f": "EUR",  # tests use the dummy exchange rate provider
     }
     payload = query_to_signing_payload(query)
     signature = generate_bleskomat_lnurl_signature(
-        payload=payload,
-        api_key_secret=bleskomat.api_key_secret,
-        api_key_encoding=bleskomat.api_key_encoding
+        payload=payload, api_key_secret=bleskomat.api_key_secret, api_key_encoding=bleskomat.api_key_encoding
     )
-    response = await client.get(f'/bleskomat/u?{payload}&signature={signature}')
+    response = await client.get(f"/bleskomat/u?{payload}&signature={signature}")
     assert response.status_code == 200
     data = response.json()
     assert data["tag"] == "withdrawRequest"
     assert data["minWithdrawable"] == 1000
     assert data["maxWithdrawable"] == 1000
     assert data["defaultDescription"] == "test valid sig"
-    assert data["callback"] == f'http://{HOST}:{PORT}/bleskomat/u'
+    assert data["callback"] == f"http://{HOST}:{PORT}/bleskomat/u"
     k1 = data["k1"]
     lnurl = await get_bleskomat_lnurl(secret=k1)
     assert lnurl
 
+
 @pytest.mark.asyncio
 async def test_bleskomat_lnurl_api_action_insufficient_balance(client, lnurl):
     bleskomat = lnurl["bleskomat"]
     secret = lnurl["secret"]
     pr = "lntb500n1pseq44upp5xqd38rgad72lnlh4gl339njlrsl3ykep82j6gj4g02dkule7k54qdqqcqzpgxqyz5vqsp5h0zgewuxdxcl2rnlumh6g520t4fr05rgudakpxm789xgjekha75s9qyyssq5vhwsy9knhfeqg0wn6hcnppwmum8fs3g3jxkgw45havgfl6evchjsz3s8e8kr6eyacz02szdhs7v5lg0m7wehd5rpf6yg8480cddjlqpae52xu"
     WALLET.pay_invoice.reset_mock()
-    response = await client.get(f'/bleskomat/u?k1={secret}&pr={pr}')
+    response = await client.get(f"/bleskomat/u?k1={secret}&pr={pr}")
     assert response.status_code == 200
-    assert response.json() == {"status": "ERROR", "reason": "Failed to pay invoice: Insufficient balance."}
+    assert response.json()["status"] == "ERROR"
+    assert "Insufficient balance" in response.json()["reason"]
     wallet = await get_wallet(bleskomat.wallet)
     assert wallet.balance_msat == 0
     bleskomat_lnurl = await get_bleskomat_lnurl(secret)
     assert bleskomat_lnurl.has_uses_remaining() == True
     WALLET.pay_invoice.assert_not_called()
 
+
 @pytest.mark.asyncio
 async def test_bleskomat_lnurl_api_action_success(client, lnurl):
     bleskomat = lnurl["bleskomat"]
@@ -111,7 +117,7 @@ async def test_bleskomat_lnurl_api_action_success(client, lnurl):
     wallet = await get_wallet(bleskomat.wallet)
     assert wallet.balance_msat == 100000
     WALLET.pay_invoice.reset_mock()
-    response = await client.get(f'/bleskomat/u?k1={secret}&pr={pr}')
+    response = await client.get(f"/bleskomat/u?k1={secret}&pr={pr}")
     assert response.json() == {"status": "OK"}
     wallet = await get_wallet(bleskomat.wallet)
     assert wallet.balance_msat == 50000