Direct Checkout Link
If you want your buyers to go directly to the checkout page and skip the intermediary Payhip product page, you can construct URLs to do this for you.
Creating a direct checkout link
Take the example of the following product page:
https://payhip.com/b/ean3D
The unique key for the product is "ean3D"
To create a direct checkout link, simply use your product key as follows:
https://payhip.com/buy?link=ean3D
How to find your unique product key
Visit your edit product page and view the address bar. This will show you the product key, as seen in the screenshot below.

Creating a direct checkout link with custom product URLs
If you have a custom domain attached to your Payhip store, you'll need to use the original product key when creating a direct checkout link.
Here is an example of a customized product URL:
https://sampledomain.com/b/my-custom-name
To create a direct checkout link, the product key should be used
https://sampledomain.com/buy?link=ean3D
Direct checkout link with multiple items
If you would like to create a checkout link where multiple items are included, then this is possible too.
Let's take the example where you have the following products
https://payhip.com.com/b/ean3D
https://payhip.com/b/BaFxk
Then the combined checkout page link would be:
https://payhip.com/buy?cart_links[]=ean3D&cart_links[]=BaFxk
This URL will take buyers directly to the checkout link where they can purchase multiple items at once.