Capturing return value from remote post hander I have a number of forms set up using Webforms (the module formerly known as yamlforms) in Drupal 8.

This data is stored in Drupal, but is also sent to a remote CRM using a Remote post handler added to the form. The CRM handler generates a key for the newly added lead that I would like to use in my success message. There's no option for capturing data from a remote post though. 

Does a solution already exist for this, or am I doomed to writing my own module?
There is no built in solution for this, you have extend the Remote post handler and write some custom code.

Please open a ticket in the Webform issue queue. Ideally, the remote post handler would be able to populate some meta data that could be exposed via a token.