Important:the “entry_data” parameters may be empty when the user hasn’t logged into your store. So, you have two options:
1. Do not render the link for the button for offline users and render it when they open a session so you can put their id on the “ref” parameter
2. Render the buttons without the “entry_data” parameters and, when you get the notification, manually take the proper steps.
If you want to put the button as a payment option on the checkout page of your storefront, it comes easier to track the purchase with the button, since you can pass the order id as entry_id and use the ref parameter for extra info you may need:
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