# Three PL -3PL

This configuration page features the option "Invoice Number Prefix" for Third-Party Logistics clients. A typical Invoice Prefix may be “INV-“(which will precede 3PL Client invoice numbers).

![P4 Warehouse Multi Client Email Configuration](/files/-Mj6w2dtNMbPdwKABQov)

{% hint style="info" %}
This screen is for configuring the email that your 3PL client will receive with their monthly invoice! 
{% endhint %}

{% hint style="warning" %}
This screen only functions IF you are using 3PL Invoicing.
{% endhint %}


---

# 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://docs.p4.software/p4warehouse-english/setup/system-configuration/three-pl-3pl.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.