As you have purchased the premium version of the OAuth Client and replaced the free plugin with the premium one, you first need to activate the premium plugin. Please refer to the steps below to activate the premium plugin.
- Go to https://portal.miniorange.com and log in with your miniOrange account which you have used to purchase the license.
- Go to the Downloads tab and download the paid plugin.
- Now, go to WordPress and uninstall the free version of the plugin and install downloaded premium plugin.
- Go to the miniOrange OAuth tab and log in with your miniOrange account which you have used to purchase the license.
- Enter your license key. (The license key is under the Manage License -> License Keys section).