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Amio Website Summary:
Let's build on top of most reliable and full feature set API for messaging. The Amio API unifies multiple messaging platforms under one REST API. Our API has resource-oriented URLs which is easy to predict. [...] For example this might occur when message is being send to Facebook Messenger and Facebook page is disconnected from Amio. [...] You can use platform_metadata attribute to send tracking data directly to Viber API. This allows you to track messages and user’s replies.