# Post-Purchase Upsell

## What is Post Purchase Upsell?

Nosto’s Post Purchase Upsell lets you present one last personalized product offer right after a customer completes payment but before they reach the Shopify Thank You page. This is done using Shopify’s Post Purchase Extensions framework, ensuring a seamless checkout flow with no redirects or popups.

The extension allows merchants to:

* Increase average order value with zero friction.
* Control the offer logic and experience via Nosto.
* Rely on Shopify to handle order editing and charging the payment method.

## How It Works in Shopify

1. Customer completes payment → Shopify creates the order and sets it to **On hold** status.
2. Nosto’s Post Purchase Upsell offer page is displayed inside the Shopify Checkout.
3. Customer accepts or declines the offer:
   * **If accepted**: Shopify edits the order and charges the payment method.
   * **If declined**: order continues to fulfillment.
4. Once the step completes, Shopify releases the order from **On hold** status.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.nosto.com/shopify/post-purchase-upsell.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.