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How Can I Append A Subscription Discount URL to the CheckOut Page on Shopify So the Discount Code Appears Automatically?

Barbara

I need help appending a discount code from a subscription app into the checkout URL so the discount code appears automatically. This subscription code comes from a third-party plug-in that does not offer developer support.

See link below for the support article I am currently trying to work with but not having any luck with:

https://support.rechargepayments.com/hc/en-us/articles/360008682454-Applying-discount-code-to-checkout-automatically