You Need to Configure the Address Verification API: A Quick Setup Guide

 If you’re seeing the message “you need to configure the address verification API,” it means your system or web app hasn’t been properly set up to validate addresses through an external API service.



Address verification APIs are used to confirm and correct mailing addresses in real-time. Popular APIs come from providers like Google, USPS, Melissa, and Smarty.

Here’s how to configure one:

  1. Sign up with your chosen provider and get your API key.

  2. Integrate the API into your form, checkout, or backend system using their documentation.

  3. Test with sample addresses to ensure the API is properly formatting, standardizing, or flagging invalid inputs.

  4. Secure your API key to avoid abuse (e.g., restrict it by IP or domain).

Common issues include:

  • Missing API key or endpoint

  • Incorrect JSON/XML formatting

  • API limits not being handled properly

Properly configuring the API ensures accurate deliveries, fewer failed shipments, and better user experience—especially during high-traffic events like product launches or open enrollment.

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