Checkout Link

Create direct checkout links to SellAuth with zero JavaScript or SDK integration.

Example

Click on "Buy Now" to see the checkout link in action:

Integration Overview

Checkout Links allow you to create a URL that instantly creates a SellAuth checkout session when opened.

This is the simplest possible integration: No JavaScript, No SDK, No embeds, No custom logic

You can use these links behind buttons, anchors, images, emails, or ads, and they will open the SellAuth checkout automatically.

When a customer opens a Checkout Link:

A checkout session is created server-side
A short loading screen is shown
A background CAPTCHA is solved automatically
The customer is redirected to the SellAuth checkout page

The loading spinner is intentional and required for bot protection.

HTML Integration

All you need to do is create a link or button that points to the Checkout Link URL:

<a
  href="https://<your shop>.mysellauth.com/checkout-link?cart[0][productId]=<product id>&cart[0][variantId]=<variant id>&cart[0][quantity]=<quantity>"
  target="_blank"
>
  <span>Buy Now</span>
</a>

Parameters

`cart` (required)

An array of cart items.

Field	Type	Required	Description
`cart[index].productId`	number	✅	Product ID
`cart[index].variantId`	number	✅	Variant ID
`cart[index].quantity`	number	✅	Quantity (1–100000)
`cart[index].parentVariantId`	number \| null	❌	ID of the variant this addon product belongs to

Other Parameters (optional)

Parameter	Type	Required	Description
`currency`	string \| null	❌	3-letter currency code
`email`	string \|null	❌	Customer email
`affiliate`	string \| null	❌	Affiliate / referral code

Example with all parameters and multiple cart items

https://<your shop>.mysellauth.com/checkout-link?cart[0][productId]=1&cart[0][variantId]=1&cart[0][quantity]=1&cart[1][productId]=3&cart[1][variantId]=3&cart[1][quantity]=2&cart[1][parentVariantId]=1&currency=USD&email=john.doe@email.com&affiliate=CREATOR123