fix(admin): resolve incorrect crypto balance calculation fallback displaying fiat amount

test_e2e.js

@@ -0,0 +1,43 @@
+const { Client } = require('pg');
+const { CryptoEngine } = require('./lib/crypto-engine');
+
+async function testE2E() {
+    const fetch = require('node-fetch');
+
+    // 1. Create a mock merchant if none
+    const client = new Client({ connectionString: process.env.DATABASE_URL });
+    await client.connect();
+    
+    let res = await client.query('SELECT * FROM merchants LIMIT 1');
+    let merchantId = res.rows[0]?.id;
+    if(!merchantId) {
+        res = await client.query(`INSERT INTO merchants (name, payment_provider) VALUES ('Test', 'stripe') RETURNING id`);
+        merchantId = res.rows[0].id;
+    }
+
+    // 2. Call create-payment-intent API
+    const createRes = await fetch('http://localhost:3000/api/create-payment-intent', {
+        method: 'POST',
+        headers: {'Content-Type': 'application/json'},
+        body: JSON.stringify({ amount: 5, currency: 'TRY', merchant_id: merchantId })
+    });
+    const createData = await createRes.json();
+    console.log("Create Data:", createData);
+
+    const txId = createData.id;
+    const solAddress = createData.wallets.SOLANA;
+    console.log("SOL Adresi:", solAddress);
+
+    // 3. Fund it! (I don't have SOL right now in memory, but I will simulate it by querying the DB to get the privatekey and sweeping? No, wait, I can just mock the balance in the CryptoEngine but it's Devnet so I can just fund it via Solana faucet or direct transfer from my gas tank).
+    // Let's actually just call /api/crypto-sweep with a wait, but we know it will fail because 0 balance. Let's see if 0 balance returns 200 with waiting!
+    const sweepRes = await fetch('http://localhost:3000/api/crypto-sweep', {
+        method: 'POST',
+        headers: {'Content-Type': 'application/json'},
+        body: JSON.stringify({ txId, network: 'SOLANA', token: 'SOL' })
+    });
+    const sweepData = await sweepRes.json();
+    console.log("Sweep Data:", sweepData);
+
+    await client.end();
+}
+testE2E().catch(console.error);