https://www.programmableweb.com/news/add-programmable-sms-to-your-net-apps/sponsored-content/2017/09/12
https://www.nexmo.com/
example - https://github.com/nexmo-community/nexmo-dotnet-quickstart/blob/488a97c576c882aeef8a7cf327bade27750f4856/NexmoDotNetQuickStarts/Controllers/SMSController.cs#L20-L38
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PHP flavor (Laravel Shift) - https://jason.pureconcepts.net/2017/09/nexmo-sms-admin-laravel/
origin - http://www.pipiscrew.com/?p=9910 add-programmable-sms-to-your-net-apps