Feature: Added self-service merchant registration and updated login onboarding flow

app/api/merchants/register/route.ts

@@ -0,0 +1,37 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { db } from '@/lib/db';
+import crypto from 'crypto';
+
+export async function POST(req: NextRequest) {
+    try {
+        const { name } = await req.json();
+
+        if (!name || name.length < 3) {
+            return NextResponse.json({ error: 'Firma adı en az 3 karakter olmalıdır.' }, { status: 400 });
+        }
+
+        // Generate a 10-char ID
+        const short_id = crypto.randomBytes(5).toString('hex');
+        const api_key = crypto.randomBytes(24).toString('hex'); // Secure API Key
+
+        // Insert into database
+        const result = await db.query(
+            `INSERT INTO merchants (name, short_id, api_key) 
+             VALUES ($1, $2, $3) 
+             RETURNING *`,
+            [name, short_id, api_key]
+        );
+
+        const merchant = result.rows[0];
+
+        return NextResponse.json({
+            success: true,
+            merchantId: merchant.id,
+            shortId: merchant.short_id,
+            apiKey: merchant.api_key
+        });
+    } catch (err: any) {
+        console.error('[Registration Error]:', err.message);
+        return NextResponse.json({ error: 'Sunucu hatası: ' + err.message }, { status: 500 });
+    }
+}