E-Mail vs. API
You have to decide whether you want to be notified by e-mail or via API webhook.
{ "text": "A new update for {{ url }} has been detected. See the difference: {{ link }}", "blocks": [ { "type": "header", "text": { "type": "plain_text", "text": "New changes for {{ url }}" } }, { "type": "section", "fields": [ { "type": "mrkdwn", "text": "{{ diffMrkdwn }}" } ] } ] }