# Modification reference

> Learn which fields a modification accepts and what each one changes.

Canonical: https://bannerify.co/docs/api-reference/modification

A modification changes one layer of a template. Send a list of them in the `modifications` field of a request. [Modifications](https://bannerify.co/docs/essentials/modifications) explains how layer names map to fields and shows examples for text, images, tables, and charts.

## Related

- [Previous: Get a template](https://bannerify.co/docs/api-reference/endpoint/template-details)
- [Documentation index](https://bannerify.co/docs/llms.txt)