> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pingtree.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Manager

> Define required fields and apply validation rules to incoming leads through the campaign's form API.

## Overview

The **API Manager** tab allows you to enforce field validation for incoming leads submitted via the **Form API**. If any required field listed in this section is missing from the payload, the system will return a **validation error**.

This ensures your traffic sources comply with the field structure required by your campaign.

<img className="block" src="https://mintcdn.com/pingtree/5J3zdrNvtKbPn5ub/assets/images/docs/documentations/campaign/settings/api-manager.png?fit=max&auto=format&n=5J3zdrNvtKbPn5ub&q=85&s=0fe0c68afe738f8cff6379ad6f83d11c" alt="All Sources" width="2179" height="972" data-path="assets/images/docs/documentations/campaign/settings/api-manager.png" />

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## Key Features

* **Required Fields Configuration**\
  Mark specific fields as required to prevent incomplete lead submissions.

* **Field Validations**\
  You can apply field-level validations for:
  * **Email Verification**
  * **Mobile Number Verification**

> Tip: This works similarly to **Sources > Field Management**, but applies at the campaign level for API submissions.