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I found the issue. I wanted this to work on custom payment button (link URL), such as https://mydomain.com/asp-payment-box/?product_id=22 but seems it only works on pages using the shortcode, is that correct?
Any way of using with LINK URLs for payment?
I have no cache plugins (fresh install just to test this), but my domain uses cloudflare. Could be the issue? How to disable cloudflare to allow your plugin work properly?