Mailchimp通过api取消合并var

I have a working sync between my local DB and mail chimp. In most cases it works fine. However there is one case that doesn't seem to work.

I am updating subscribers using the Subscribe method. With both update_existing and replace_interests set to true.

I can set merge vars via this method. However I don't seem to be able to unset them.

I have tried

• Not putting item in the array at all.
• Passing an empty string in the merge vars array for the value.
• Passing flase as the value.
• Passing null as the value.

None of which seem to affect the value at all.