2 件の回答
You dont need to have a button in email for that.
You can enable email approval response and set api access for the required users.
To enable email approval response for your organization, from Setup, enter Process Automation Settings in the Quick Find box, then select Process Automation Settings, select the Enable Email Approval Response checkbox, and click Save.
Then users can just reply to the email as "Approved" or "Rejected" to approve/reject the record