# API03002: Missing Required Parameters

## What This Means[​](#what-this-means "Direct link to What This Means")

The request is missing data that the server needs to complete the action. Required fields were not included in the request.

## Common Causes[​](#common-causes "Direct link to Common Causes")

* **Incomplete form** — Required fields weren't filled in
* **Data not saved** — Form data wasn't captured properly
* **Version mismatch** — Plugin expects different parameters than the POS sends
* **Custom fields** — Required custom fields are missing

## How to Fix[​](#how-to-fix "Direct link to How to Fix")

### 1. Complete Required Fields[​](#1-complete-required-fields "Direct link to 1. Complete Required Fields")

Check that all required information is filled in:

* Customer details (if required)
* Product information
* Order details

### 2. Refresh and Retry[​](#2-refresh-and-retry "Direct link to 2. Refresh and Retry")

The form state may be incomplete:

1. Refresh the POS
2. Re-enter the required information
3. Try the action again

### 3. Check Plugin Versions[​](#3-check-plugin-versions "Direct link to 3. Check Plugin Versions")

Ensure compatibility:

* Update the WCPOS plugin
* Update the POS application
* Both should be on compatible versions

### 4. Check Required Field Settings[​](#4-check-required-field-settings "Direct link to 4. Check Required Field Settings")

In WooCommerce, some fields may be marked as required:

* Review checkout field requirements
* Check custom field configurations
* Adjust requirements if needed

### 5. Check Custom Integrations[​](#5-check-custom-integrations "Direct link to 5. Check Custom Integrations")

If using custom plugins or integrations:

* They may require additional fields
* Review plugin documentation
* Check for conflicts

## Related Errors[​](#related-errors "Direct link to Related Errors")

* [API03001](/error-codes/API03001.md) — Invalid Request Format
* [API03003](/error-codes/API03003.md) — Invalid Parameter Value