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Wix App Templates for Developers

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Deployment instructions:

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Before you get started, make sure you have the following:

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Your app name will be used as the namespace suffix.

Name your app to generate a namespace. This lets you refer to your app in code later on.

# About the Data Extension Schema API

A data extension schema allows you to define and validate the structure of additional custom fields that can be dynamically added to Wix API objects. This schema acts as a blueprint, describing the properties, data types, and constraints for these custom `extendedFields` fields, based on a [JSON schema](fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/the-json-schema) as part of the [schema plugin extension](fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/about-schema-plugin-extensions). For example, a data extension schema can describe custom shipping data added to the [Wix eCommerce Checkout object](portalId::d1972c09-74e2-4d36-a6f2-54e3310d4ad9resourceId::38074d2d-0934-4f0e-a442-db544d43e9cbslug::checkout-object*fallback::https://dev.wix.com/docs/rest/business-solutions/e-commerce/checkout/checkout-object).  

The Data Extension Schema API enables you to: 
- [Retrieve all the data extension schemas](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/list-data-extension-schemas) installed on a specific site.
- [Create](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/create-data-extension-schema) and [update](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/update-data-extension-schema) user-defined schemas for a specific site.

Learn more about [reading and writing schema plugin fields](portalId::63e3acd8-2a9c-421d-8f92-d02930eeb59eresourceId::7e864ebe-b9bf-4d12-9871-9eba8c1b15d2*fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/about-reading-and-writing-schema-plugin-fields).

### User-defined data extension schemas
A user-defined data extension schema is created when a Wix user creates their own extended fields. This schema is saved under a dedicated `_user_fields` `namespace`. For example, Wix users can add their own fields to the checkout flow in the site's dashboard under **Settings** > **Checkout** > **Checkout form** when they edit the checkout form: 

![Checkout extended fields](https://wixmp-833713b177cebf373f611808.wixmp.com/images/eff5a2b4063b0b0b648c2b6f149a6949.png)  

The resulting user-defined data extension is saved in the `_user_fields` `namespace`.

## Before you begin
It's important to note the following before starting to code:
- App schema plugin extensions, including their JSON schemas, are created and maintained in an [app dashboard](fallback::https://manage.wix.com/studio/custom-apps). This API only supports creating and updating **user-defined** schemas.
- Schema plugin extensions are supported by select [Wix API objects](fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/about-schema-plugin-extensions#see-also). Always check that the object you would like to extend includes a property named `extendedFields`.
- This API supports retrieving data extension schemas from [multiple `namespaces`](portalId::63e3acd8-2a9c-421d-8f92-d02930eeb59eresourceId::7e864ebe-b9bf-4d12-9871-9eba8c1b15d2#namespaces*fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/about-reading-and-writing-schema-plugin-fields#namespaces) in a single call.
- Data extension schemas are supported by select [Wix API service entities](fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/about-schema-plugin-extensions#see-also). Always check that the service object you would like to extend supports this functionality.
- `namespace` name limitations:
  - Can't include "Wix".
  - Only supports lowercase letters, numbers, hyphens, and underscores.
  - Max length: 164 characters.
  - Once set, `namespace` names can't be changed.


## Use cases
- [Retrieve a list of all data extension schemas for the Wix eCommerce Checkout object](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/sample-flows#retrieve-a-list-of-all-data-extension-schemas-for-the-wix-ecommerce-checkout-object)
- [Add a field to a user-defined data extension schema](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/sample-flows#add-a-field-to-a-user-defined-data-extension-schema-for-the-wix-ecommerce-order-object)
  
## Terminology
- **Data extension schema**: A JSON schema defining the data structure of the custom fields to add to a Wix object. 
- **FQDN**: Fully qualified domain name, a unique identifier for a Wix object. Learn more about [FQDNs](portalId::d1972c09-74e2-4d36-a6f2-54e3310d4ad9resourceId::a41f8d61-0aa4-4ccf-ab8e-09b8e0d9bbfc*fallback::https://dev.wix.com/docs/rest/articles/getting-started/fqdns).
- **Namespace**: A unique identifier for your app or project. Expected format is @myCompany/myAppName. See limitations in the Before you begin section above.
- **Schema plugin extension**: Specific functionality that extends a Wix object with custom fields, nested in the object called `extendedFields`.
- **User-defined schema**: The schema created when a Wix user creates their own extended fields. This schema is created with the `namespace`: `_user_fields`.

# Sample Flows

This article shares some possible use cases you could support, as well as an example flow that could support each use case. 
You're certainly not limited to these use cases, but they can be a helpful jumping off point as you plan your implementation.

## Retrieve a list of all data extension schemas for the Wix eCommerce Checkout object 
If your functionality requires access to fields that have been added to an object, you might want to retrieve all of the schemas at once. For example, displaying the returned fields in a widget. 

1. Collect the FQDN of the relevant Wix API service object that [supports schema plugin extensions](fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/about-schema-plugin-extensions#see-also). FQDNs are also returned as `entityFqdn` in most events. The Wix eCommerce Checkout FQDN is `wix.ecom.v1.checkout`.
2. Choose the namespaces you would like to retrieve this data for. You can pass multiple namespaces in one call, or leave it blank to retrieve all available namespaces.
4. Call [List Data Extension Schemas](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/list-data-extension-schemas) with the FQDN, namespace data, and `fields`: `ARCHIVED`. This will ensure any archived fields are returned, and will provide a complete schema.
5. Display the returned data in your extension as relevant.


## Add a field to a user-defined data extension schema for the Wix eCommerce Order object
Display a site-specific field, such as alcohol by volume (ABV) for whiskey orders, alongside fields from Wix eCommerce Orders, in a widget.

1.  Collect the FQDN of the relevant Wix API object that [supports schema plugin extensions](fallback::https://dev.wix.com/docs/build-apps/develop-your-app/extensions/backend-extensions/schema-plugins/about-schema-plugin-extensions#see-also). FQDNs are also returned as `entityFqdn` in most events. The Wix eCommerce Order FQDN is `wix.ecom.v1.order`.
2. Call [List Data Extension Schemas](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/list-data-extension-schemas) with the `wix.ecom.v1.order` FQDN and `_user_fields` namespace to check if a user-defined schema exists.
3. Create or update the `_user_fields` namespace, as relevant:
    1. If no `_user_fields` namespace schema exists, call [Create Data Extension Schema](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/create-data-extension-schema) with the `wix.ecom.v1.order` FQDN, the `_user_fields` namespace and the new JSON schema.
    1. If a `_user_fields` namespace schema already exists, call [Update Data Extension Schema](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/update-data-extension-schema) with the `wix.ecom.v1.order` FQDN, the `_user_fields` namespace and the updated JSON schema.  Make sure to specify the entire schema, as any field not specified will be deleted.
4. Display the user-defined field in your widget.
5. When the user updates the value of the field, call [Update Order](fallback::https://dev.wix.com/docs/rest/business-solutions/e-commerce/orders/update-order) and specify the `_user_fields` namespace and the field's key and value.
For example:
```
"extendedFields": {
            "namespaces": {
                "_user_fields": {
                    "ABV": "60%"
                }
            }
        }
```

> **Note**: Once you have added at least one user-defined field, you should call [List Data Extension Schemas](fallback::https://dev.wix.com/docs/rest/business-management/data-extension-schema/list-data-extension-schemas) every time a user navigates to your widget, to collect and display the user fields.