fix: resolve TX-DYNAMIC 404 error and enhance multi-chain API support

app/api/create-payment-intent/route.ts

@@ -85,13 +85,15 @@ export async function POST(req: NextRequest) {
         };
 
         // 4. Log transaction in Supabase
+        let txId = '';
         try {
-            await db.query(`
+            const dbResult = await db.query(`
                 INSERT INTO transactions (
                     amount, currency, status, stripe_pi_id, source_ref_id, 
                     customer_name, customer_phone, callback_url, merchant_id, 
                     provider, metadata
                 ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
+                RETURNING id
             `, [
                 amount, currency, 'pending', providerTxId, ref_id,
                 customer_name, customer_phone, callback_url, resolvedMerchantId,
@@ -101,11 +103,13 @@ export async function POST(req: NextRequest) {
                     wallets: cryptoWallets
                 })
             ]);
+            txId = dbResult.rows[0].id;
         } catch (dbError) {
             console.error('Database log error:', dbError);
         }
 
         return NextResponse.json({
+            id: txId,
             clientSecret: clientSecret,
             nextAction,
             redirectUrl,