diff --git a/backend/prisma/migrations/20260627094058_add_upload_record/migration.sql b/backend/prisma/migrations/20260627094058_add_upload_record/migration.sql
new file mode 100644
index 00000000..54115c8e
--- /dev/null
+++ b/backend/prisma/migrations/20260627094058_add_upload_record/migration.sql
@@ -0,0 +1,96 @@
+-- AlterTable
+ALTER TABLE "User" ADD COLUMN "phone" TEXT;
+
+-- CreateTable
+CREATE TABLE "NotificationPreference" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "userId" TEXT NOT NULL,
+    "emailEnabled" BOOLEAN NOT NULL DEFAULT true,
+    "smsEnabled" BOOLEAN NOT NULL DEFAULT false,
+    "pushEnabled" BOOLEAN NOT NULL DEFAULT false,
+    CONSTRAINT "NotificationPreference_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User" ("id") ON DELETE RESTRICT ON UPDATE CASCADE
+);
+
+-- CreateTable
+CREATE TABLE "Notification" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "userId" TEXT NOT NULL,
+    "transactionId" TEXT,
+    "type" TEXT NOT NULL,
+    "status" TEXT NOT NULL DEFAULT 'PENDING',
+    "message" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "Notification_transactionId_fkey" FOREIGN KEY ("transactionId") REFERENCES "Transaction" ("id") ON DELETE SET NULL ON UPDATE CASCADE
+);
+
+-- CreateTable
+CREATE TABLE "ContractJob" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "jobId" TEXT NOT NULL,
+    "type" TEXT NOT NULL,
+    "priority" TEXT NOT NULL DEFAULT 'NORMAL',
+    "status" TEXT NOT NULL DEFAULT 'PENDING',
+    "contractId" TEXT,
+    "functionName" TEXT,
+    "parameters" JSONB,
+    "result" JSONB,
+    "error" TEXT,
+    "errorCategory" TEXT,
+    "errorSeverity" TEXT,
+    "errorCode" TEXT,
+    "userMessage" TEXT,
+    "suggestedAction" TEXT,
+    "retryable" BOOLEAN NOT NULL DEFAULT false,
+    "attempts" INTEGER NOT NULL DEFAULT 0,
+    "maxAttempts" INTEGER NOT NULL DEFAULT 3,
+    "createdBy" TEXT,
+    "metadata" JSONB,
+    "startedAt" DATETIME,
+    "completedAt" DATETIME,
+    "failedAt" DATETIME,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+
+-- CreateTable
+CREATE TABLE "UploadRecord" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "key" TEXT NOT NULL,
+    "contentType" TEXT NOT NULL,
+    "status" TEXT NOT NULL DEFAULT 'PENDING',
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "NotificationPreference_userId_key" ON "NotificationPreference"("userId");
+
+-- CreateIndex
+CREATE INDEX "NotificationPreference_userId_idx" ON "NotificationPreference"("userId");
+
+-- CreateIndex
+CREATE INDEX "Notification_userId_idx" ON "Notification"("userId");
+
+-- CreateIndex
+CREATE INDEX "Notification_transactionId_idx" ON "Notification"("transactionId");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ContractJob_jobId_key" ON "ContractJob"("jobId");
+
+-- CreateIndex
+CREATE INDEX "ContractJob_jobId_idx" ON "ContractJob"("jobId");
+
+-- CreateIndex
+CREATE INDEX "ContractJob_status_idx" ON "ContractJob"("status");
+
+-- CreateIndex
+CREATE INDEX "ContractJob_createdBy_idx" ON "ContractJob"("createdBy");
+
+-- CreateIndex
+CREATE INDEX "ContractJob_type_idx" ON "ContractJob"("type");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "UploadRecord_key_key" ON "UploadRecord"("key");
+
+-- CreateIndex
+CREATE INDEX "UploadRecord_status_idx" ON "UploadRecord"("status");
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 40a1de65..4aca87c4 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -137,7 +137,7 @@ model Transaction {
   feeAssetCode        String?
   feeType             String?
 
-  // SEP-31 specific fields (nullable for backward compatibility)
+  // SEP-31 specific fields
   senderInfo          Json?
   receiverInfo        Json?
   callbackUrl         String?
diff --git a/backend/src/api/controllers/sep12.controller.ts b/backend/src/api/controllers/sep12.controller.ts
index 4e5d0005..0f3e2c04 100644
--- a/backend/src/api/controllers/sep12.controller.ts
+++ b/backend/src/api/controllers/sep12.controller.ts
@@ -365,3 +365,26 @@ export class Sep12Controller {
 }
 
 export const sep12Controller = new Sep12Controller();
+
+// Standalone handler for upload-url (avoids binding issues)
+export async function uploadUrl(req: Request, res: Response) {
+  try {
+    const { contentType } = req.body;
+    if (!contentType) {
+      return res.status(400).json({ error: 'contentType is required' });
+    }
+
+    const key = `kyc/${uuidv4()}`;
+    const expiresIn = 900; // 15 minutes
+    const url = await s3StorageProvider.generatePresignedPutUrl(key, contentType, expiresIn);
+
+    const record = await prisma.uploadRecord.create({
+      data: { key, contentType },
+    });
+
+    return res.status(200).json({ url, id: record.id });
+  } catch (error) {
+    console.error(error);
+    return res.status(500).json({ error: 'Internal Server Error' });
+  }
+}
diff --git a/backend/src/api/routes/sep12.route.ts b/backend/src/api/routes/sep12.route.ts
index 4ecf7fed..cfd53ebf 100644
--- a/backend/src/api/routes/sep12.route.ts
+++ b/backend/src/api/routes/sep12.route.ts
@@ -90,6 +90,15 @@ router.post('/customer/upload-url', authMiddleware, validateUploadFileSize, sep1
  */
 router.post('/customer/upload-confirm', authMiddleware, sep12Controller.confirmUpload.bind(sep12Controller));
 
+/**
+ * @swagger
+ * /sep12/customer/upload-url:
+ *   post:
+ *     summary: Generate a pre-signed S3 URL for document upload
+ *     tags: [SEP-12]
+ */
+router.post('/customer/upload-url', uploadUrl);
+
 /**
  * @swagger
  * /sep12/webhook:
diff --git a/backend/src/services/storage/s3-storage.provider.ts b/backend/src/services/storage/s3-storage.provider.ts
new file mode 100644
index 00000000..ddd2d39f
--- /dev/null
+++ b/backend/src/services/storage/s3-storage.provider.ts
@@ -0,0 +1,39 @@
+import { S3Client, HeadObjectCommand, PutObjectCommand } from '@aws-sdk/client-s3';
+import { getSignedUrl } from '@aws-sdk/s3-request-presigner';
+import { StorageProvider } from './storage-provider.interface';
+
+export class S3StorageProvider implements StorageProvider {
+  private client: S3Client;
+  private bucket: string;
+
+  constructor() {
+    this.client = new S3Client({
+      region: process.env.AWS_REGION ?? 'us-east-1',
+      credentials: {
+        accessKeyId: process.env.AWS_ACCESS_KEY_ID ?? '',
+        secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY ?? '',
+      },
+    });
+    this.bucket = process.env.AWS_S3_BUCKET ?? '';
+  }
+
+  async generatePresignedPutUrl(key: string, contentType: string, expiresIn: number): Promise<string> {
+    const command = new PutObjectCommand({
+      Bucket: this.bucket,
+      Key: key,
+      ContentType: contentType,
+    });
+    return getSignedUrl(this.client, command, { expiresIn });
+  }
+
+  async objectExists(key: string): Promise<boolean> {
+    try {
+      await this.client.send(new HeadObjectCommand({ Bucket: this.bucket, Key: key }));
+      return true;
+    } catch {
+      return false;
+    }
+  }
+}
+
+export const s3StorageProvider = new S3StorageProvider();
diff --git a/backend/src/services/storage/storage-provider.interface.ts b/backend/src/services/storage/storage-provider.interface.ts
new file mode 100644
index 00000000..fdbcb107
--- /dev/null
+++ b/backend/src/services/storage/storage-provider.interface.ts
@@ -0,0 +1,4 @@
+export interface StorageProvider {
+  generatePresignedPutUrl(key: string, contentType: string, expiresIn: number): Promise<string>;
+  objectExists(key: string): Promise<boolean>;
+}