The extension should support all versions of PHP that are supported by Magento. The following is from the documentation:
-For Magento 2.2.X (https://devdocs.magento.com/guides/v2.2/install-gde/system-requirements-tech.html)
The extension should support all versions of PHP that are supported by Magento. The following is from the documentation:
-For Magento 2.2.X (https://devdocs.magento.com/guides/v2.2/install-gde/system-requirements-tech.html)