> ## 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.

# Update Stacking Rules

> Updates the stacking rules.

Only the provided fields will be updated. However, if you update an array, the content of the array is overwritten. This means that if you want to add new values to an array and retain existing ones, you need to provide both the existing and new values in the request.

> 📘 Stacking Rules Documentation
>
> Read [the Stacking Rules article](https://support.voucherify.io/article/604-stacking-rules) to learn how they work.