I'm trying to link a contact an opportunity using API v3.1 according to https://api.insightly.com/v3.1/Help#!/Opportunities/AddLink
Due to missing documentation I don't know what to give for ...
I'm looking to search all opportunities that have an empty custom value. The URL is:
I'm configuing custom opportunity views. I need to select field STATE_REASON. It's not listed in List View Columns.