# Implementation principle of app option price add-on

### 1. Draft order (default)

<figure><img src="https://2625127081-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FadDQ5oZA6CM3C6sDtLH7%2Fuploads%2FcCMLdqsBYoLNubahejjy%2Fimage.png?alt=media&#x26;token=baea78f5-4a00-420f-9114-ff2373dca9ae" alt=""><figcaption></figcaption></figure>

<figure><img src="https://2625127081-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FadDQ5oZA6CM3C6sDtLH7%2Fuploads%2FCllrOsnqcn6OnO6IOw5q%2Fimage.png?alt=media&#x26;token=8ced8e3b-a9e3-4cf6-973c-ae2ff0546f12" alt=""><figcaption></figcaption></figure>

### 2. Binding variant principle:&#x20;

Bind option A to variant A. After option A is selected, the bound variant A will also be added to the shopping cart. Please refer to the attached iamge 1

<figure><img src="https://2625127081-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FadDQ5oZA6CM3C6sDtLH7%2Fuploads%2F7yAPFBkbBOQEzAAA9wZv%2Fimage.png?alt=media&#x26;token=b8377220-710d-4b3d-8ed8-63b3325f9f12" alt=""><figcaption></figcaption></figure>

### 3. The one-cent principle:&#x20;

Create a one-cent variant in shopify. If the add-on price is $100, 10,000 one-cent products will be added at checkout, which is exactly $100.&#x20;

This principle is not open yet, if you need it, please create a one-cent variant in the shopify background, and send me the variant id, and I will set it up for you.

<figure><img src="https://2625127081-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FadDQ5oZA6CM3C6sDtLH7%2Fuploads%2FacHOkTCrJcsxH9XhgwMR%2Fimage.png?alt=media&#x26;token=8d0eb416-49a8-44dc-830c-9360a7da45d0" alt=""><figcaption></figcaption></figure>
