Rocket.chat
URL Format
rocketchat://[username@]rocketchat-host/token[/channel|@recipient]*
Creating a Webhook in Rocket.chat
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Open up the chat Administration by clicking on Administration menu

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Open Integrations and then click New

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Fill in the information for the webhook and click Save. Please don't forget to Enable your integration.

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If you did everything correctly, Rocket.chat will give you the URL and Token to your newly created webhook.

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Format the service URL
rocketchat://your-domain.com/8eGdRzc9r4YYNyvge/2XYQcX9NBwJBKfQnphpebPcnXZcPEi32Nt4NKJfrnbhsbRfX
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token
See official guide.