No API for Chargeback Reports or Summaries

In lib/Api/, there are no APIs provided for the following:

• Chargeback Details Report: https://{urlPrefix}/reporting/v3/chargebackdetails?
  startTime={startTime}&endTime={endTime}
• Chargeback Summaries Report: https://api.cybersource.com/reporting/v3/retrievalsummaries?
  startTime={startTime}&endTime={endTime}

Where {urlPrefix} is "api.cybersource.com" or "apitest.cybersource.com", and {startTime}/{endTime} are ISO 8601 timestamps like "2017-10-01T10:10:10+05:00"

Since these two endpoints have different parameters and URIs than the regular report downloads (/reporting/v3/report-downloads) in lib/Api/ReportDownloadsApi.php, that one cannot be used.

I kept trying to use ReportDownloadsApi.php mistakenly and kept getting a resource not found error. The Servlet to REST API Migration Guide says the Chargeback reports are retired.

However, I eventually tracked down a PDF called Reporting_API_WellsFargoPaymentGateway.pdf that reveals they are not in fact retired, and gives the required URI and parameters.

I think it would be very helpful to include API classes for Chargeback Details and Summaries reports.

Start by reading lib/Api/ReportDownloadsApi.php and compare its conventions with the Chargeback Details and Chargeback Summaries URIs and parameters in the issue. Use the linked migration guide and the Reporting_API_WellsFargoPaymentGateway.pdf reference to verify the endpoints. Done means API classes exist for both chargeback reports and expose their documented parameters.