Resetting memberPage to blank

Hey all - trying to update a member in Memberstack using integromat and I basically need to reset their memberPage to blank. For example they cancel a membership and I am deleting them from Webflow and then updating MemberStack to remove their Webflow details including “resetting” the memberPage to blank. I’ve tried sending the HTTP request with:
"memberPage": null
"memberPage": ""
"memberPage": "null"
But none of those seem to work properly. What am I doing wrong?