Currently I'm managing website X and this website has Google Analytics and Google Tag Manager set up. I understand that GTM can be used to track the number of clicks on the ebanner on website X. However, information got lost somewhere and nobody now has access to website X's GTM. I still have access to website X's account.
Is there any other ways I can track the clickthrough rate for the ebanner? I cannot use GA because the ebanner links to another website that does not belong to website X.