first commit

app/modules/snap/services/snap.service.js

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+const midtransCore = require('../../../core/midtrans.service');
+const paymentLogger = require('../../../helpers/payment_logger.helper');
+const db = require('../../../../models/migration');
+
+class SnapService {
+    async createTransaction(payload) {
+        let { order_id, external_id, amount, customer_details, item_details } = payload;
+
+        if (!amount) {
+            let order = null;
+            if (order_id) order = await db.Order.findByPk(order_id);
+            if (!order && external_id) order = await db.Order.findOne({ where: { orderID: external_id } });
+
+            if (!order) throw new Error("Amount wajib diisi atau order_id/external_id tidak valid");
+            amount = order.total;
+            payload.amount = amount;
+        }
+
+        const parameter = {
+            transaction_details: {
+                order_id: external_id,
+                gross_amount: amount
+            },
+            customer_details: customer_details,
+            item_details: item_details,
+            usage_limit: 1,
+            expiry: {
+                duration: parseInt(process.env.MIDTRANS_EXPIRY_DURATION || 24),
+                unit: process.env.MIDTRANS_EXPIRY_UNIT || 'hour'
+            }
+        };
+
+        try {
+            const response = await midtransCore.getSnap().createTransaction(parameter);
+
+            await paymentLogger.log(response, payload);
+
+            return response;
+        } catch (error) {
+            throw new Error(`Midtrans Snap Error: ${error.message}`);
+        }
+    }
+}
+
+module.exports = new SnapService();