[chore, feat] Send FedEx SmartPost registration to correct endpoint, prep carrier account parameters (#515)

- Add enums for some common carrier account types
- Update carrier account creation endpoint flow to use enums
- Reorg base-child relationship of carrier account creation parameter sets to remove unnecessary parameters
- Add FedExSmartpost parameter set
- FedExSmartpost uses different endpoint for creation
- Update unit tests, re-record cassettes as needed
- Reduce line coverage

Author: nwithan8

EasyPost.Tests/Fixture.cs

@@ -56,8 +56,8 @@ internal static Dictionary<string, object> BasicPickup
 
                 const string pickupDate = "2023-05-12";
 
-                fixture.AddOrUpdate("min_datetime", pickupDate);
-                fixture.AddOrUpdate("max_datetime", pickupDate);
+                fixture!.AddOrUpdate("min_datetime", pickupDate);
+                fixture!.AddOrUpdate("max_datetime", pickupDate);
 
                 return fixture;
             }
@@ -227,7 +227,6 @@ internal static ParameterSets.CarrierAccount.Create Create(Dictionary<string, ob
                         Reference = fixture.GetOrNull<string>("reference"),
                         Credentials = fixture.GetOrNull<Dictionary<string, object?>>("credentials"),
                         TestCredentials = fixture.GetOrNull<Dictionary<string, object?>>("test_credentials"),
-                        RegistrationData = fixture.GetOrNull<Dictionary<string, object?>>("registration_data"),
                     };
                 }
 
@@ -239,8 +238,6 @@ internal static ParameterSets.CarrierAccount.CreateFedEx CreateFedEx(Dictionary<
                     {
                         Description = fixture.GetOrNull<string>("description"),
                         Reference = fixture.GetOrNull<string>("reference"),
-                        Credentials = fixture.GetOrNull<Dictionary<string, object?>>("credentials"),
-                        TestCredentials = fixture.GetOrNull<Dictionary<string, object?>>("test_credentials"),
                         AccountNumber = "123456789",
                         CorporateAddressCity = "San Francisco",
                         CorporateAddressCountryCode = "US",

EasyPost.Tests/ServicesTests/WithParameters/CarrierAccountServiceTest.cs

@@ -60,7 +60,7 @@ public async Task TestCreateWithCustomWorkflow()
             // Carriers like FedEx and UPS should hit the `/carrier_accounts/register` endpoint
             Dictionary<string, object> data = Fixtures.BasicCarrierAccount;
 
-            Parameters.CarrierAccount.Create parameters = Fixtures.Parameters.CarrierAccounts.CreateFedEx(data);
+            Parameters.CarrierAccount.CreateFedEx parameters = Fixtures.Parameters.CarrierAccounts.CreateFedEx(data);
 
             try
             {
@@ -92,7 +92,7 @@ public async Task TestPreventUsersUsingGenericParameterSetWithCustomWorkflow()
             Dictionary<string, object> data = Fixtures.BasicCarrierAccount;
 
             // Override the type to be a custom type
-            data["type"] = Constants.CarrierAccountTypes.FedExAccount;
+            data["type"] = CarrierAccountType.FedEx.Name;
             data["registration_data"] = new Dictionary<string, object>();
 
             Parameters.CarrierAccount.Create parameters = Fixtures.Parameters.CarrierAccounts.Create(data);