Power Automate Custom Connector

I have created a Custom Connector in Power Automate to use as part of an automated flow. The following properties are not visible in when calling the API: company_number, company_type, date_of_cessation and date_of_creation.

The following properties are listed: item, kind, self, item, item, item, snippet and kind but it doesn’t seem possible to determine what these relate to.

I’m working on something similar at the moment and would be happy to team up on this. Have you gotten any further?