How to send grafana alert to slack

Hi All,

I am trying to send alert to slack channel from Grafana.
I have a webhook url, which is POST method using two json fields(customer name, tenant id) and it is created using slack workflow.

I used that url in contact point while sending alerts from Grafana. But it is not sending the alert, instead triggering another message like “new customer onboarded”.

So, how to send the alert to that slack channel…? Do I need to generate a new webhook url for grafana, or I can used the same…? Pls help.