GET - https://staging.subscribercrmapi.acamh.org/api/subscriptionfrequency
Lists all Subscription Frequencies.
[ { "Id": 1, "RenewalInterval": 12, "Title": "Annual", "Description": null, "Period": 2 }, { "Id": 2, "RenewalInterval": 1, "Title": "Monthly", "Description": null, "Period": 2 }]