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# Resource: Add-Ons

# Type: Add On Object

# Link: https://dev.wix.com/docs/api-reference/business-solutions/bookings/services/add-ons/add-on-object.md

## Description: Add-ons are optional extras that extend business offerings (such as booking services) with additional features, time, or products for an extra cost.

## Schema:

```json
 Type: Add On Object | type: AddOn
 Description: Add-ons are optional extras that extend business offerings (such as booking services) with additional features, time, or products for an extra cost.
       - name: id  | type: string | description: Add-on ID.
           - name: value  | type: string | description: 
       - name: revision  | type: string | description: Revision number, which increments by 1 each time the add-on is updated. To prevent conflicting changes, the current revision must be passed when updating the add-on.  Ignored when creating an add-on.
           - name: value  | type: string | description: 
       - name: createdDate  | type: string | description: Date and time the add-on was created in `YYYY-MM-DDThh:mm:ss.sssZ` format.
           - name: seconds  | type: string | description: 
           - name: nanos  | type: number | description: 
       - name: updatedDate  | type: string | description: Date and time the add-on was last updated in `YYYY-MM-DDThh:mm:ss.sssZ` format.
       - name: name  | type: string | description: Display name of the add-on shown to customers.
       - name: price  | type: Money | description: Pricing information for the add-on.
           - name: value  | type: string | description: Add-on price amount as a decimal string with period as decimal separator. For example, `3.99` for a $3.99 add-on or `15.00` for a $15.00 add-on.
           - name: currency  | type: string | description: Currency code for the add-on price. Must be a valid [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) currency code. For example, `USD` for US dollars or `EUR` for euros.
           - name: formattedValue  | type: string | description: Add-on price amount as a decimal string in local format for display purposes. For example, `$3.99` for US format or `3,99 €` for European format.
       - name: taxGroup  | type: string | description: ID of the [tax group](https://dev.wix.com/docs/rest/business-solutions/e-commerce/extensions/tax/tax-groups/introduction.md) to categorize the add-on for tax calculation in [Wix eCommerce](https://dev.wix.com/docs/rest/business-solutions/e-commerce/introduction.md). Learn more about [how Wix eCommerce implements tax calculation](https://dev.wix.com/docs/rest/business-solutions/e-commerce/extensions/tax/introduction.md).  This field doesn't apply to custom checkout/billing implementations.
       - name: extendedFields  | type: ExtendedFields | description: Data extensions enabling users to save custom data related to the add-on.
           - name: namespaces  | type: object | description: Extended field data. Each key corresponds to the namespace of the app that created the extended fields. The value of each key is structured according to the schema defined when the extended fields were configured.  You can only access fields for which you have the appropriate permissions.  Learn more about [extended fields](https://dev.wix.com/docs/rest/articles/getting-started/extended-fields.md).
       - name: tags  | type: Tags | description: [Tags](https://dev.wix.com/docs/rest/business-management/tags/introduction.md) assigned to add-ons for categorization and filtering purposes.
           - name: privateTags  | type: TagList | description: Tags that require an additional permission in order to access them, normally not given to site members or visitors.
               - name: tagIds  | type: Array<string> | description: List of tag IDs.
           - name: tags  | type: TagList | description: Tags that are exposed to anyone who has access to the labeled entity itself, including site members and visitors.

```