Added method getInvoicesForContact

src/classes/XeroAccountingApi.cls

@@ -88,14 +88,14 @@ public with sharing class XeroAccountingApi {
 
     /**
     *   @author Ben Edwards ([email protected])
-    *   @description Method to return ALL contacts for your Xero environment
-    *   @return List of Xero Contact wrapper classes
+    *   @description Method to return ALL invoices for your Xero environment
+    *   @return List of Xero Invoice wrapper classes
     **/
     public static List<XeroInvoice> getInvoices () {
 
         List<XeroInvoice> xeroInvoices = new List<XeroInvoice>();
 
-        // Execute the callout to the Contacts resource
+        // Execute the callout to the Invoice resource
         HttpResponse response = XeroCalloutUtility.executeCallout('GET', 'Invoices', null);
 
         // If successful response
@@ -113,6 +113,33 @@ public with sharing class XeroAccountingApi {
         return xeroInvoices;
     }
 
+    /**
+    *   @author Ben Edwards ([email protected])
+    *   @description Method to return all invoices for a given Contact Id
+    *   @return List of Xero Invoice wrapper classes
+    **/
+    public static List<XeroInvoice> getInvoicesForContact (String xeroContactId) {
+
+        List<XeroInvoice> xeroInvoices = new List<XeroInvoice>();
+
+        // Execute the callout to the Invoice resource with the Contact ID filter
+        HttpResponse response = XeroCalloutUtility.executeCallout('GET', 'Invoices?where=Contact.ContactID%20%3D%20Guid%28%22' + xeroContactId + '%22%29', null);
+
+        // If successful response
+        if (response.getStatusCode() == 200) {
+
+            // Use the parser to convert the response into Xero objects
+            xeroInvoices = XeroCalloutResponseParser.parseInvoices(response.getBody());
+        }
+        else {
+
+            // Raise error
+            throw new XeroAccountingApiException(response.getStatusCode() + ': ' + response.getBody());
+        }
+
+        return xeroInvoices;
+    }
+
     /**
     *   @author Ben Edwards ([email protected])
     *   @description Method to create an invoice in Xero. 

src/classes/XeroAccountingApiTest.cls

@@ -132,8 +132,6 @@ public class XeroAccountingApiTest {
 
 		Test.stopTest();
 
-		system.debug('### ' + xeroInvoices);
-
 		// Assert that a contact exists
 		system.assertEquals(
 			1,
@@ -172,6 +170,31 @@ public class XeroAccountingApiTest {
 		Test.stopTest();
 	}
 
+	/**
+	* 	@author Ben Edwards ([email protected])
+	*	@description Test a successful callout of the getInvoicesForContact() method
+	**/
+	@isTest
+	static void getInvoicesForContactSuccess() {
+
+		// Set the Mock Class for the callout
+		Test.setMock(HttpCalloutMock.class, getStaticMock(200, 'XeroInvoicesMock'));
+
+		Test.startTest();
+
+		// Execute the callout
+		List<XeroInvoice> xeroInvoices = XeroAccountingApi.getInvoicesForContact('ABC123');
+
+		Test.stopTest();
+
+		// Assert that a contact exists
+		system.assertEquals(
+			1,
+			xeroInvoices.size(),
+			'There should be one invoice returned from the callout'
+		);
+	}
+
 	/**
 	* 	@author Ben Edwards ([email protected])
 	*	@description Test a successful callout of the createInvoice() method

src/classes/XeroCalloutResponseParser.cls

@@ -15,7 +15,7 @@ public with sharing class XeroCalloutResponseParser {
         String jsonSerialized = generateJsonStringForParsing (jsonBody, 'Contacts');
 
         // And finally parse the now re-serialized contact list back into Contact objects
-        return (List<XeroContact>) JSON.deserializeStrict(jsonSerialized, List<XeroContact>.class);
+        return (List<XeroContact>) JSON.deserialize(jsonSerialized, List<XeroContact>.class);
     }
 
     /**
@@ -29,7 +29,7 @@ public with sharing class XeroCalloutResponseParser {
         String jsonSerialized = generateJsonStringForParsing (jsonBody, 'Invoices');
 
         // And finally parse the now re-serialized contact list back into Contact objects
-        return (List<XeroInvoice>) JSON.deserializeStrict(jsonSerialized, List<XeroInvoice>.class);
+        return (List<XeroInvoice>) JSON.deserialize(jsonSerialized, List<XeroInvoice>.class);
     }
 
     /**