# How the Merge Works

* The Sender Profile dynamically merges Return Address data into the sender section of the mail piece
* This ensures consistent sender information across all campaigns using the same Sender Profile
* If you update a Sender Profile, changes will apply to future orders only

> **⚠️ Previously processed or already mailed orders will not be updated.**

<br>


---

# Agent Instructions: 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:

```
GET https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/sender-fields-and-sender-profiles/how-the-merge-works.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.