How to apply a coupon on an existing checkout in Shopify?

Mervin · December 20, 2022, 5:14am

Hi ,

I want to apply coupon on existing checkout. I have tried https://shopify.dev/api/storefront/2022-04/mutations/checkoutDiscountCodeApplyV2 this API but this returns checkoutUserErrors in checkoutID.

I am using checkout create webhook, that returns response from that I have taken

“abandoned_checkout_url”:"https:store.myshopify.com\69343117630/checkouts*XXXX*?key=YYYY

This is the checkout ID I used

$checkoutID = base64_encode(“gid://shopify/Checkout/XXXX?key=YYYY”);

Could anyone help me
Thanks

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