App Extension | Flow Action | Custom Configuration

[brdrsmth]

I'm working on developing a Flow Action App Extension. I intend to set up a custom configuration page to take in some additional data. I have  my [[settings.fields]] configured in my shopify.extension.toml file, and I have my validation, preview, and config urls defined and working properly for the app extension. 

When I take in submitted information from my custom configuration page how do I pass this information back to the Flow Action so that it's saved in the Flow Action Config? 

I see that when I use the native Shopify form for editing step information that this mutation updateStepConfiguration gets called, but I don't see that anywhere in the documentation.

Is there an accessible api to pass back information from my custom configuration page to the Flow Action? 

[brdrsmth]

Not sure there's a good way to do this. For anyone interested, I ended up using the step_reference returned in the validation step as an identifier in my db and and aggregating extra information for the flow there for retrieval on execution