The Events API allows developers to build applications that respond to activities in Slack. User and bot based event subscriptions can be received in JSON format. Once event types are specified, Slack will provide a stream of data with this RESTful API. This API uses OAuth 2.0 for authentication; developers need to register their applications to obtain a Client ID and Client Secret for response procedures.
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The Slack Events PHP SDK by Jarrad Littleford is a PHP wrapper for the Slack Events API. This project is a simple PHP wrapper that uses Guzzle 6 to request API endpoints (as defined in Slack APIs documentation).