FlexDeploy has a few built-in providers available for webhooks. You also have the option of creating a custom provider.
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Access providers by navigating to Administration → Integrations → Webhooks and clicking 
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Creating/Editing Webhook Providers
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Each provider has a match script and a list of properties. The match script should verify an incoming webhook is from its provider and return true or false. Properties can be defined and used in both the match script and all functions of the provider. A The match script should verify an incoming webhook is from its provider and return true or false. The script may validate an incoming webhook by a signature or secret set in that the provider application, or with other authentication methods. The editing window has capabilities for undo, redo, find, find and replace, and go to line. There are a variety of built-in context variables and methods available to use in this script. Type Ctrl + Space for suggestions on variables and methods you can use. {{screenshot of a provider}}Our built-in providers have match scripts already implemented, but these may need to be modified depending on your configuration.