> ## Documentation Index
> Fetch the complete documentation index at: https://voucherify-pw-further-tests.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Create Metadata Schema

> Creates a new metadata (custom attribute) schema for a given resource.

The schema consists of a set of key-value pairs to customize Voucherify resources. 

You can nest your object within a standard metadata schema, e.g. within a campaign or customer schema. However, your nested object can't include another nested object. The standard metadata schemas are:
- Campaign
- Voucher
- Publication
- Redemption
- Product
- Customer
- Order
- Order line item
- Loyalty Tier
- Promotion Tier
- Earning rule
- Reward

Use this endpoint to define a metadata schema of a given resource for the first time. Once you configure a metadata schema for a given `related_object`, use the PUT [Update metadata schema](ref:update-metadata-schema) endpoint to either update or add new metadata key-value pairs. For example, use this endpoint to define a metadata schema for `related_object: campaign` for the first time. If you want define a new metadata property for `campaign`, use the [PUT Update metadata schema](ref:update-metadata-schema) endpoint.

> 📘 Metadata Documentation
>
> Read [the Getting Started with Metadata](https://support.voucherify.io/article/99-schema-validation-metadata) and [Metadata Mapping](doc:metadata-mapping) articles to learn how metadata work in Voucherify.