> For the complete documentation index, see [llms.txt](https://userguide.zappost.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://userguide.zappost.com/zap-post-web-app/zap-post-user-guide/zap-app/using-the-zapp/settings/zap-settings.md).
# ZAP Settings
ZAP settings is a simple page containing some key settings for your ZAP Account. \
\
Here you can configure your ROAS reporting settings as well as how often your recipients are allowed to receive ZAPs and how long your data should be stored for.
## ROAS Settings
Return on Ad Spend reporting is enabled by connecting one of our integration platforms that includes sales data. Should you have ROAS enabled and wish to change any settings you can do so here:
### Default Match Back Method
There are 3 match back options in ZAP\~POST when attributing a sale to a ZAP Campaign. \
\
**Customer** - Order received for customer with the same email or customer ID as a ZAP recipient who received mail in the last 42 days. \
\
**Address** - Order received from a customer at a postcode targeted by a ZAP Campaign in the last 42 days.\
\
**Any** - Order matched by by customer or address will show here. \
\
Be sure to save your changes.
### Include VAT?
By default ROAS reporting will show VAT free values. Should you wish to include VAT in your reporting figures, then enable this setting.
Be sure to save your changes.
## Operational Settings
### Recipient Send Limiter
This setting will allow you limit how frequently you want to send to a single recipient. When switched on you will be asked to provide a number of days, weeks or months. This figure will then be checked against everyone you attempt to mail to ensure they're not within their send frequency limit. \
\
This allows users to connect automated mailing pipelines but not worry they're sending multiple mailing to people in quick succession.
### GDPR Data Purge Frequency
This setting will dictate how long we hold your submission data before we cleanse it from our system. \
By default your GDPR cleanse setting will be 6 months however this can be changed to the value that best matches your data security policies.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://userguide.zappost.com/zap-post-web-app/zap-post-user-guide/zap-app/using-the-zapp/settings/zap-settings.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.