Create a Checkout URL

Use this guide to dynamically build URLs that generate Simpler checkout carts.

1. Base URL

All checkout URLs start with:

https://checkout.simpler.so/

2. Required Parameters

Parameter	Type	Description
app	UUID	Your App ID (placeholder: 00000000-0000-0000-0000-000000000000).
prd	JSON	URL-encoded JSON array of product objects (see below).
cur	String	3-letter ISO currency code (e.g. EUR, USD).

2.1. prd Array Format

prd is the URL-encoded JSON string of an array of products. Each product object must include:

• id (string): The product identifier. This is either the internal product ID or the SKU, depending on your integration.
• qty (integer): quantity
• attrs (object): optional attribute map (e.g. size, edition). If attributes are omitted and the product requested has attributes, the URL will lead to an options selection page before checkout.

Example JSON:

[
  { "id":"67", "qty":1, "attrs":{ "attribute_size":"" } },
  { "id":"93", "qty":1, "attrs":{ "attribute_edition":"Digital", "attribute_pa_color":"" } },
  { "id":"33", "qty":2, "attrs":{} }
]

3. Optional Parameters

Parameter	Type	Description
lang	String	Locale code (e.g. en_US, fr_FR).
cpn	String	Coupon code (e.g. SUMMER21).
source	String	Origin of checkout (e.g. cart_page).
metadata	JSON	Free-form JSON object (e.g. utm_medium).

4. Example URLs

4.1. One-Line Example

https://checkout.simpler.so/?app=00000000-0000-0000-0000-000000000000&prd=[{"id":"67","qty":1,"attrs":{"attribute_size":""}},{"id":"93","qty":1,"attrs":{"attribute_edition":"Digital","attribute_pa_color":""}},{"id":"33","qty":2,"attrs":{}}]&cur=EUR&lang=en_US&source=cart_page&cpn=SUMMER21&metadata={"utm_medium":"Simpler"}

4.2. Pretty-Printed Example

https://checkout.simpler.so/?
  app=00000000-0000-0000-0000-000000000000&
  prd=[
    {"id":"67","qty":1,"attrs":{"attribute_size":""}},
    {"id":"93","qty":1,"attrs":{"attribute_edition":"Digital","attribute_pa_color":""}},
    {"id":"33","qty":2,"attrs":{}}
  ]&
  cur=EUR&
  lang=en_US&
  source=cart_page&
  cpn=SUMMER21&
  metadata={"utm_medium":"Simpler"}

5. Verify

Visit the URL in your browser and verify that it is correct. You should be seeing Simpler's Checkout with the options you specified (coupon*, language, products etc).

info

Coupon

Coupons may not be available based on their validity and availability. If you are using coupons, ensure you have the correct coupon code and that it is valid for the current order.