An app broke my checkout / buy button, can you fix a checkout app conflict?

Yes. When an upsell, wallet, or bundle app collides with another checkout extension you can get a dead buy button, a frozen cart, or Checkout extensibility errors at the Thank-You page. We isolate which extension owns each checkout step, fix the order of operations, and re-test the full add-to-cart → checkout → order-confirmation path. For deeper checkout work, see our Shopify checkout bug-fixing page.