Modifying access permissions to a project

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I am the owner of a project and I have added several users with the default permissions (“can edit”) which allows them to accidentally make modifications to my project. Rather than modify each user’s permissions individually, I’m thinking of writing a shell script that uses curl to change the permissions of several users to “commenters”. I tried the following command but I get back an error with a very unhelpful message (“Not Found”). What, if anything, am I doing wrong?

Note: I have replaced personal data (GIDs, API tokens) with generic text between <<>>.

curl --request PUT \
     --url<<membership_gid>> \
     --header 'authorization: Bearer <<my_api_token>>' \
     --header 'accept: application/json' \
     --header 'Asana-Enable: new_memberships' \
     --header 'content-type: application/json' \
     --data '{"data": {
  "member": "<<member_gid>>",
  "parent": "<<project_gid>>",
  "resource_type": "membership",
  "resource_subtype": "project_membership",
  "standard_access_level": "commenter" }}'

@sasha_f you are the master of this endpoint, and I am a bit lost to be honest with the aborted migration.