Error on sending message via incoming webhook

@Gaz492 wrote:

Summary

Unable to parse incoming data

Steps to reproduce

Use php-curl to send data via a incoming webhook
see code below
https://pastebin.com/jq2wV0hp

Expected behavior

Posts message into channel

Observed behavior

Returns
{"id":"web.incoming_webhook.parse.app_error","message":"Unable to parse incoming data","detailed_error":"","request_id":"9u67wozjapf53fm1xacfts8cqc","status_code":400}

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