i am using php to create new newsletter user via api. With adding the user to the list the workflow for the DoubleOptIn, created in Sendinblue, gets started. After the confirmation of the user, i want to send an email to the user, but not via sendinblue. Instead i want to send the email from php. So, how can i catch the DOI Confirmation from the user to trigger my php email?
Thanks, Daniel