Facebook.Messenger.Api (nuget): Facebook Messenger API for .NET by CloudRail provides an instant messaging service and software application in which you can send text, image, videos and files.  Get a free license key at: https://cloudrail.com      Features: - Send text messages - Send files, images, videos and audios - Parse messages received on your webhook - Download the content of an attachment sent to your webhook - Advance Request: Use any Facebook Messenger functionality that is missing from CloudRail  Platform Supports: Cloudrail SDK is built with Microsoft .NET Standard 2.0 which supports the following - .NET Framework 4.6.1 - .NET Core 2.0 - Mono 5.4
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