> For the complete documentation index, see [llms.txt](https://docs.p4.software/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.p4.software/p4warehouse-english/setup/system-configuration/three-pl-3pl.md).

# 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 %}


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