Grocery cashback stacking means earning from one receipt on multiple apps, and the classic pair is Ibotta for product rebates plus Fetch for receipt points.

Activate Ibotta offers before you shop, check Fetch bonus brands for the week, and buy only what you already needed.

Scan the receipt into Ibotta first to confirm rebates, then into Fetch and any third app, keeping the paper receipt until all credits appear.

Stack further with store sales, manufacturer coupons, and a cashback card, since each layer comes from a different party and is fully legitimate.

Never submit the same receipt twice to one app, alter receipts, or use other people's receipts, as apps ban accounts permanently for this.