> For the complete documentation index, see [llms.txt](https://layerlabs.gitbook.io/phone-verification-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://layerlabs.gitbook.io/phone-verification-system/requirements.md).

# Requirements

{% hint style="danger" %}
To be able to make use of the phone verification system, you have to make sure that the following requirements are fulfilled

* PHP 7.4 or PHP 8.1
* Latest Ioncube Loaders
* Non strict firewall (to perform license checks)
* Latest version of WHMCS
* A License Key to run the script
* If using Twilio: A Twilio account, with credit, and an outgoing phone number.
* If using Nexmo: A Nexmo account, with credit.
* If using Clickatell: A Clickatell account, with credit.
* If using MessageBird: A MessageBird account, with credit.
* If using MaxMind's MinFraud: A MinFraud account, with credit.
* FTP client to assist with file upload
  {% endhint %}


---

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