McDonald's customers often participate in surveys through mcdvoice.com survey to provide feedback and receive coupons as rewards. However, these survey coupons typically apply to in-store or drive-thru orders, not online or mobile app orders. The terms and conditions on the coupon will specify its use, so it’s crucial to read them carefully. Online systems usually cannot process physical coupons, as they require manual entry by staff during in-person visits. If you’re unsure, check with your local McDonald's to confirm if they accept survey coupons for online purchases. Always keep the coupon handy to redeem during your next visit!