For AI agents: the complete documentation index is available at https://docs.clickmax.io/en/llms.txt, the full documentation bundle is available at https://docs.clickmax.io/en/llms-full.txt, and this page is available as Markdown at https://docs.clickmax.io/en/faq/payments/one-click-buy-upsell-downsell.md.
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      • What is One Click Buy in Clickmax?

      One Click Buy is the one-click purchase: after the first purchase at the checkout, the customer can accept an upsell or downsell offer without entering their payment details again. It raises your average order value by reusing the card already given on the initial sale.

      If it didn't work

      • The upsell/downsell offer does not appear: check the product setup in Edit a product.
      • The charge was declined on the second click: see the error codes.