Your tax engine references these classes to manage tax information with Salesforce
Billing. They can't be modified.
The following are the blng namespace classes required
for integrating Salesforce Billing with an external tax engine.
TaxParameters Class
Contains a list of setters to populate the data needed for a tax calculation. The data is passed in the tax callout.
TaxResults Class
Contains a list of setter methods to populate the data returned from a tax callout. The data is passed back to Salesforce Billing from the tax connector.
TaxEngines Interface
Your tax engine implements this interface. It contains methods for calculating tax, clearing in-memory entities from the previous call, and clearing legal references from the previous call.
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