If you have an outdated PHP version, you may get a notification in the backend of WooCommerce. The PHP version is defined at the server level, or in other words through your hosting provider.

PHP is a server side scripting language that is embedded in HTML. It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites.
It is integrated with a number of popular databases, including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server.

The PHP version can only be updated by your hosting provider. Please clearly indicate in this request that it is a PHP update related to an API link protocol. The upgrade process is a simple one and should be something that your hosting provider can do for you without affecting your website or charging you a fee. Here is a sample letter you can send to your hosting company:

Dear hosting,

I am using a WooCommerce webshop on one of your servers. WooCommerce has recommended using at least PHP 7.1. WordPress, the content management system that WooCommerce uses, has listed PHP 7.4 as the recommended version on their requirements page: https://wordpress.org/about/requirements/.

Can you let me know if you support PHP 7.4 or higher and how I can upgrade?

I look forward to your reply.

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