A customer wants to know if they can use our API to run a script (or batch process) on their newly migrated data in production so that all posts with a certain attribute are floated to the top of their respective boards.
There's not a single REST API call to support this use case, but it could be done as a two step process assuming that the REST API supports getting the messages by the "certain attribute" you had in mind.
First you'd make a REST API call to get your list of messages meeting the critera you desired. Then for each of those messages, you could obtain a MessageSubscriptionContext object and use the "global/add" method. This method accepts a parameter named "subscription.type" for which you'll want to specify the value "float". For example, the REST API call might look like this for a single message:
/restapi/vc/messages/id/1271/subscriptions/global/add?subscription.type=float
