diff --git a/lnbits/core/services.py b/lnbits/core/services.py
index 10b33073..28203c58 100644
--- a/lnbits/core/services.py
+++ b/lnbits/core/services.py
@@ -33,6 +33,10 @@ class PaymentFailure(Exception):
     pass
 
 
+class InvoiceFailure(Exception):
+    pass
+
+
 async def create_invoice(
     *,
     wallet_id: str,
@@ -50,7 +54,7 @@ async def create_invoice(
         amount=amount, memo=invoice_memo, description_hash=description_hash
     )
     if not ok:
-        raise Exception(error_message or "Unexpected backend error.")
+        raise InvoiceFailure(error_message or "Unexpected backend error.")
 
     invoice = bolt11.decode(payment_request)
 
diff --git a/lnbits/core/views/api.py b/lnbits/core/views/api.py
index 02cb788a..7c8cf8b9 100644
--- a/lnbits/core/views/api.py
+++ b/lnbits/core/views/api.py
@@ -12,7 +12,13 @@ from lnbits import bolt11
 from lnbits.decorators import api_check_wallet_key, api_validate_post_request
 
 from .. import core_app, db
-from ..services import PaymentFailure, create_invoice, pay_invoice, perform_lnurlauth
+from ..services import (
+    PaymentFailure,
+    InvoiceFailure,
+    create_invoice,
+    pay_invoice,
+    perform_lnurlauth,
+)
 from ..tasks import sse_listeners
 
 
@@ -67,15 +73,20 @@ async def api_payments_create_invoice():
         memo = g.data["memo"]
 
     async with db.connect() as conn:
-        payment_hash, payment_request = await create_invoice(
-            wallet_id=g.wallet.id,
-            amount=g.data["amount"],
-            memo=memo,
-            description_hash=description_hash,
-            extra=g.data.get("extra"),
-            webhook=g.data.get("webhook"),
-            conn=conn,
-        )
+        try:
+            payment_hash, payment_request = await create_invoice(
+                wallet_id=g.wallet.id,
+                amount=g.data["amount"],
+                memo=memo,
+                description_hash=description_hash,
+                extra=g.data.get("extra"),
+                webhook=g.data.get("webhook"),
+                conn=conn,
+            )
+        except InvoiceFailure as e:
+            return jsonify({"message": str(e)}), 520
+        except Exception as exc:
+            raise exc
 
     invoice = bolt11.decode(payment_request)
 
diff --git a/lnbits/extensions/amilk/views_api.py b/lnbits/extensions/amilk/views_api.py
index 1ebfe02c..4b8cad18 100644
--- a/lnbits/extensions/amilk/views_api.py
+++ b/lnbits/extensions/amilk/views_api.py
@@ -37,12 +37,15 @@ async def api_amilkit(amilk_id):
     except LnurlException:
         abort(HTTPStatus.INTERNAL_SERVER_ERROR, "Could not process withdraw LNURL.")
 
-    payment_hash, payment_request = await create_invoice(
-        wallet_id=milk.wallet,
-        amount=withdraw_res.max_sats,
-        memo=memo,
-        extra={"tag": "amilk"},
-    )
+    try:
+        payment_hash, payment_request = await create_invoice(
+            wallet_id=milk.wallet,
+            amount=withdraw_res.max_sats,
+            memo=memo,
+            extra={"tag": "amilk"},
+        )
+    except Exception as e:
+        return jsonify({"message": str(e)}), HTTPStatus.INTERNAL_SERVER_ERROR
 
     r = httpx.get(
         withdraw_res.callback.base,
diff --git a/lnbits/extensions/bleskomat/models.py b/lnbits/extensions/bleskomat/models.py
index d014f25a..cec138e6 100644
--- a/lnbits/extensions/bleskomat/models.py
+++ b/lnbits/extensions/bleskomat/models.py
@@ -86,10 +86,13 @@ class BleskomatLnurl(NamedTuple):
                     raise LnurlValidationError("Maximum number of uses already reached")
             tag = self.tag
             if tag == "withdrawRequest":
-                payment_hash = await pay_invoice(
-                    wallet_id=self.wallet,
-                    payment_request=query["pr"],
-                )
+                try:
+                    payment_hash = await pay_invoice(
+                        wallet_id=self.wallet,
+                        payment_request=query["pr"],
+                    )
+                except Exception as exc:
+                    raise LnurlValidationError(f"Failed to pay invoice: {exc.message}")
                 if not payment_hash:
                     raise LnurlValidationError("Failed to pay invoice")
 
diff --git a/lnbits/extensions/lnticket/views_api.py b/lnbits/extensions/lnticket/views_api.py
index 3c77ced0..6201a801 100644
--- a/lnbits/extensions/lnticket/views_api.py
+++ b/lnbits/extensions/lnticket/views_api.py
@@ -116,12 +116,16 @@ async def api_ticket_make_ticket(form_id):
 
     nwords = len(re.split(r"\s+", g.data["ltext"]))
     sats = g.data["sats"]
-    payment_hash, payment_request = await create_invoice(
-        wallet_id=form.wallet,
-        amount=sats,
-        memo=f"ticket with {nwords} words on {form_id}",
-        extra={"tag": "lnticket"},
-    )
+
+    try:
+        payment_hash, payment_request = await create_invoice(
+            wallet_id=form.wallet,
+            amount=sats,
+            memo=f"ticket with {nwords} words on {form_id}",
+            extra={"tag": "lnticket"},
+        )
+    except Exception as e:
+        return jsonify({"message": str(e)}), HTTPStatus.INTERNAL_SERVER_ERROR
 
     ticket = await create_ticket(
         payment_hash=payment_hash, wallet=form.wallet, **g.data
diff --git a/lnbits/extensions/offlineshop/lnurl.py b/lnbits/extensions/offlineshop/lnurl.py
index adee1d03..13944a29 100644
--- a/lnbits/extensions/offlineshop/lnurl.py
+++ b/lnbits/extensions/offlineshop/lnurl.py
@@ -64,15 +64,19 @@ async def lnurl_callback(item_id):
         )
 
     shop = await get_shop(item.shop)
-    payment_hash, payment_request = await create_invoice(
-        wallet_id=shop.wallet,
-        amount=int(amount_received / 1000),
-        memo=item.name,
-        description_hash=hashlib.sha256(
-            (await item.lnurlpay_metadata()).encode("utf-8")
-        ).digest(),
-        extra={"tag": "offlineshop", "item": item.id},
-    )
+
+    try:
+        payment_hash, payment_request = await create_invoice(
+            wallet_id=shop.wallet,
+            amount=int(amount_received / 1000),
+            memo=item.name,
+            description_hash=hashlib.sha256(
+                (await item.lnurlpay_metadata()).encode("utf-8")
+            ).digest(),
+            extra={"tag": "offlineshop", "item": item.id},
+        )
+    except Exception as exc:
+        return jsonify(LnurlErrorResponse(reason=exc.message).dict())
 
     resp = LnurlPayActionResponse(
         pr=payment_request,
diff --git a/lnbits/extensions/subdomains/views_api.py b/lnbits/extensions/subdomains/views_api.py
index 1edc562e..c11cd4be 100644
--- a/lnbits/extensions/subdomains/views_api.py
+++ b/lnbits/extensions/subdomains/views_api.py
@@ -1,15 +1,10 @@
-import re
 from quart import g, jsonify, request
 from http import HTTPStatus
-from lnbits.core import crud
-import json
 
-import httpx
-from lnbits.core.crud import get_user, get_wallet
+from lnbits.core.crud import get_user
 from lnbits.core.services import create_invoice, check_invoice_status
 from lnbits.decorators import api_check_wallet_key, api_validate_post_request
 
-from .util import isValidDomain, isvalidIPAddress
 from . import subdomains_ext
 from .crud import (
     create_subdomain,
@@ -169,12 +164,16 @@ async def api_subdomain_make_subdomain(domain_id):
 
     ## ALL OK - create an invoice and return it to the user
     sats = g.data["sats"]
-    payment_hash, payment_request = await create_invoice(
-        wallet_id=domain.wallet,
-        amount=sats,
-        memo=f"subdomain {g.data['subdomain']}.{domain.domain} for {sats} sats for {g.data['duration']} days",
-        extra={"tag": "lnsubdomain"},
-    )
+
+    try:
+        payment_hash, payment_request = await create_invoice(
+            wallet_id=domain.wallet,
+            amount=sats,
+            memo=f"subdomain {g.data['subdomain']}.{domain.domain} for {sats} sats for {g.data['duration']} days",
+            extra={"tag": "lnsubdomain"},
+        )
+    except Exception as e:
+        return jsonify({"message": str(e)}), HTTPStatus.INTERNAL_SERVER_ERROR
 
     subdomain = await create_subdomain(
         payment_hash=payment_hash, wallet=domain.wallet, **g.data
diff --git a/lnbits/extensions/withdraw/lnurl.py b/lnbits/extensions/withdraw/lnurl.py
index 39c3d917..e699e5b4 100644
--- a/lnbits/extensions/withdraw/lnurl.py
+++ b/lnbits/extensions/withdraw/lnurl.py
@@ -119,11 +119,10 @@ async def api_lnurl_callback(unique_hash):
 
         await update_withdraw_link(link.id, **changes)
     except ValueError as e:
-        return jsonify({"status": "ERROR", "reason": str(e)}), HTTPStatus.OK
+        return jsonify({"status": "ERROR", "reason": str(e)})
     except PermissionError:
-        return (
-            jsonify({"status": "ERROR", "reason": "Withdraw link is empty."}),
-            HTTPStatus.OK,
-        )
+        return jsonify({"status": "ERROR", "reason": "Withdraw link is empty."})
+    except Exception as e:
+        return jsonify({"status": "ERROR", "reason": str(e)})
 
     return jsonify({"status": "OK"}), HTTPStatus.OK
diff --git a/lnbits/wallets/spark.py b/lnbits/wallets/spark.py
index d80e3cc9..5d0f024a 100644
--- a/lnbits/wallets/spark.py
+++ b/lnbits/wallets/spark.py
@@ -49,7 +49,7 @@ class SparkWallet(Wallet):
                         timeout=40,
                     )
             except (OSError, httpx.ConnectError, httpx.RequestError) as exc:
-                raise SparkError("error connecting to spark: " + str(exc))
+                raise UnknownError("error connecting to spark: " + str(exc))
 
             try:
                 data = r.json()
@@ -123,7 +123,7 @@ class SparkWallet(Wallet):
                 payment_hash = pay["payment_hash"]
 
                 if len(pays) > 1:
-                    raise Exception(
+                    raise SparkError(
                         f"listpays({payment_hash}) returned an unexpected response: {listpays}"
                     )