Hi,
it can definitely be achieved by a single click. since you are asking in standard try to follow the below steps and see if it can be achieved.
1.once the user clicks on the unsubscription link, the REST API call must be made to ACS to update subscription schema using PUT call.
2.once API call is made, we can direct the user to a confirmation page which is opt-out landing pages.
this should definitely work.
Regards,
Raj
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