fix(btcpay webhook handler): respond with 200 immediately if there is no metadata

pages/api/btcpay/webhook.ts

@@ -27,7 +27,7 @@ type BtcpayBody = Record<string, any> & {
   timestamp: number
   storeId: string
   invoiceId: string
-  metadata: DonationMetadata
+  metadata?: DonationMetadata
   paymentMethod: string
 }
 
@@ -59,6 +59,10 @@ async function handleBtcpayWebhook(req: NextApiRequest, res: NextApiResponse) {
     return
   }
 
+  if (!body.metadata) {
+    return res.status(200).json({ success: true })
+  }
+
   if (body.type === 'InvoicePaymentSettled') {
     // Handle payments to funding required API invoices ONLY
     if (body.metadata.staticGeneratedForApi === 'false') {
@@ -105,6 +109,8 @@ async function handleBtcpayWebhook(req: NextApiRequest, res: NextApiResponse) {
 
     await Promise.all(
       paymentMethods.map(async (paymentMethod) => {
+        if (!body.metadata) return
+
         const cryptoAmount = Number(paymentMethod.paymentMethodPaid)
 
         if (!cryptoAmount) return