Saves a product current state. For details, see the Introducing the IFrame API topic.
Specifies a state file name without an extension, up to 36 symbols length. If such a file exists, it will be overwritten. You can pass this parameter for any user except master and default. If you omit this parameter, then a new file name is generated.
Returns a promise with a return-to-edit URL, userId, and stateId.