Using the Freemius API to check if a licence is valid

checkLicence.php

<?php

/**
 * Check to see if our licence is valid
 *
 * @param $license
 *
 * @return bool
 */
function checkLicence( $license ) {

    define( 'FS__API_SCOPE', 'plugin' );
    define( 'FS__API_DEV_ID', 0001 );
    define( 'FS__API_PUBLIC_KEY', 'pk_xxxxxxxxxxxxxxxxx' );
    define( 'FS__API_SECRET_KEY', 'sk_xxxxxxxxxxxxxxxxx' );

    // Init SDK.
    $api = new Freemius_Api( FS__API_SCOPE, FS__API_DEV_ID, FS__API_PUBLIC_KEY, FS__API_SECRET_KEY );

    // Get all products.
    $result = $api->Api( sprintf( '/licenses/%s.json', $license ) );

    if ( property_exists( $result, 'error' ) ) {
        return false;
    } else {
        try {
            $now        = new DateTime();
            $expiration = new DateTime( $result->expiration );
            $activated  = $result->activated;

            if ( $activated && $expiration >= $now ) {
                return true;
            }

            return false;
        } catch ( Exception $exception ) {
            return false;
        }
    }
}