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# Merge fields for email and callout templates

## Docs

- [Merge field syntax](https://zuora.ferndocs.com/docs/platform/extensibility/events-and-notifications/merge-fields-for-email-and-callout-templates/merge-field-syntax-for-email-and-callout-templates.md): Describes the merge field syntax you can use to include related object data in email or callout templates.
- [Data source merge fields](https://zuora.ferndocs.com/docs/platform/extensibility/events-and-notifications/merge-fields-for-email-and-callout-templates/data-source-merge-fields-for-email-and-callout-templates.md): Most events that email or callout templates relate to are mapped to a data source. You can use fields from the data source as merge fields in email and callout templates to customize your notification emails and callouts.
- [System merge fields](https://zuora.ferndocs.com/docs/platform/extensibility/events-and-notifications/merge-fields-for-email-and-callout-templates/system-merge-fields-for-email-and-callout-templates.md): Describes system merge fields used to include system-level information in email and callout templates.
- [Examples of using merge fields](https://zuora.ferndocs.com/docs/platform/extensibility/events-and-notifications/merge-fields-for-email-and-callout-templates/examples-of-using-merge-fields.md): Provides common use cases and examples for using merge fields.