Retrieve rulesets for creating a contract change

This API endpoint allows you to get the ruleset for creating a contract change for an engagement of a particular country, engagement type and contracting type.
Use country_code with engagement_type and contracting_type to get more detailed rules.
Alternatively, use engagement_id (on its own) to fetch the ruleset relating to a specific engagement.
Either engagement_id or country_code with engagement_type are required.
contracting_type is only required when engagement_type is contract.