backend/src/payment/dto/prepare-payment.dto.ts

import { IsString, IsNotEmpty, IsEnum } from 'class-validator';
import { PayType } from '../../entities/payment.entity';

export class PreparePaymentDto {
  @IsString()
  @IsNotEmpty()
  orderId: string; // Actually number in our system, but PRD said string, we'll convert

  @IsEnum(PayType)
  @IsNotEmpty()
  payType: PayType;
}