diff --git a/src/DonorPerfect.php b/src/DonorPerfect.php
index 681f30c..ea59e60 100644
--- a/src/DonorPerfect.php
+++ b/src/DonorPerfect.php
@@ -125,20 +125,42 @@ protected function callInternal(array $params)
         if (strlen(static::$baseUrl . $relativeUrl) > 8000) {
             throw new Exception('The DonorPerfect API call exceeds the maximum length permitted (8000 characters)');
         }
+        // Create filters to remove any credentials from the response
+        $pattern = [
+            '/(apikey=)([^&]*)/',
+            '/(pass=)([^&]*)/'
+        ];
+        $replacement = [
+            '${1}**APIKEY**',
+            '${1}**PASSWORD**'
+        ];
         // Make the request
-        $response = (string) $this->client->request('GET', $relativeUrl)->getBody();
+        try{
+            $response = (string) $this->client->request('GET', $relativeUrl)->getBody();
+        }
+        catch(Exception $e){
+            // Conceal any credentials in the error to prevent them from being displayed in output
+            $error = $e->getMessage();
+            $error = preg_replace($pattern, $replacement, $error);
+            throw new Exception($error);
+        }
 
         // Fix values with invalid unescaped XML values
         $response = preg_replace('|(?Umsi)(value=\'DATE:.*\\R*\')|', 'value=\'\'', $response);
 
         // Turn the response into a usable PHP array
         $response = json_decode(json_encode(simplexml_load_string($response)), true);
-
+        
         // Handle error messages
         if (array_key_exists('error', $response)) {
+            // conceal any credentials in the error to prevent them from being displayed in output
+            $response['error'] = preg_replace($pattern, $replacement, $response['error']);
             throw new Exception($response['error']);
         } elseif (isset($response['field']['@attributes']['value']) && $response['field']['@attributes']['value'] === 'false') {
-            throw new Exception($response['field']['@attributes']['reason']);
+            // conceal any credentials in the error to prevent them from being displayed in output
+            $error = $response['field']['@attributes']['reason'];
+            $error = preg_replace($pattern, $replacement, $error);
+            throw new Exception($error);
         }
 
         // Handle empty responses
@@ -448,7 +470,7 @@ public static function prepareParams($data, $params)
             }
 
             // Handle a param not being included in the data
-            if (!isset($data[$param])) {
+            if (!isset($data[$param]) || $data[$param] === '') {
                 $return[$param] = null;
                 continue;
             }
@@ -793,6 +815,7 @@ public function dp_savegift($data)
             'currency'            => ['string', 3], // If you use the multi-currency feature, enter appropriate code value per your currency field – e.g; 'USD', 'CAD', etc.
             'receipt_delivery_g'  => ['string', 1], // This field sets receipt delivery preference for the specified gift. Supply one of the following single letter code values: • N = do not acknowledge • E = email • B = email and letter • L = letter
             'acknowledgepref'     => ['string', 3], // Used in Canadian DonorPerfect systems to  indicate official receipt acknowledgement preference code: • 1AR – Acknowledge/Receipt • 2AD – Acknowledge / Do Not Receipt • 3DD – Do Not Acknowledge / Do Not Receipt
+            'rcpt_type'           => ['string', 1], // C for consolidated or I for individual or NULL for unset
         ]));
     }
 
@@ -924,7 +947,7 @@ public function dp_saveaddress($data)
             'mobile_phone'       => ['string', 40], //
             'address3'           => ['string', 100], //
             'address4'           => ['string', 100], //
-            'ukcountry'          => ['string', 100], //
+            'ukcounty'           => ['string', 100], //
             'org_rec'            => ['string', 1], // Enter 'Y' to check the Org Rec field (indicating an organizational record) or 'N' to leave it unchecked to indicate an individual record.
         ]));
     }
@@ -966,12 +989,17 @@ public function dp_savecode($data)
         return $this->call('dp_savecode', static::prepareParams($data, [
             'field_name'        => ['string', 20], // Enter the name of an existing field type from the DPCODES table
             'code'              => ['string', 30], // Enter the new CODE value
-            'description'       => ['string', 100], // Enter the description value that will appear in drop-down selection values
+            'description'       => ['string', 100], // Enter the description value that will appear in drop-down selection values
             'original_code'     => ['string', 20], // Enter NULL unless you are updating an existing code.  In that case, set this field to the current (before update) value of the CODE
             'code_date'         => ['date'], // Enter NULL
             'mcat_hi'           => ['money'], // Enter NULL
             'mcat_lo'           => ['money'], // Enter NULL
             'mcat_gl'           => ['string', 1], // Enter NULL
+            'reciprocal'        => null,
+            'mailed'            => null,
+            'printing'          => null,
+            'other'             => null,
+            'goal'              => null,
             'acct_num'          => ['string', 30], // Enter NULL
             'campaign'          => ['string', 30], // Enter NULL
             'solicit_code'      => ['string', 30], // Enter NULL
@@ -1063,7 +1091,7 @@ public function mergemultivalues($data)
         return $this->call('mergemultivalues', static::prepareParams($data, [
             'matchingid'  => ['numeric'], //  Specify the desired donor_id
             'fieldname'   => ['string', 20], // Enter the name of the checkbox field name.
-            'valuestring' => ['string', 20], // Enter any CODE values to be set. Separate with commas. Any code values not specified will be unset (unchecked).
+            'valuestring' => ['string', 7000], // Enter any CODE values to be set. Separate with commas (max 20 chars per code). Any code values not specified will be unset (unchecked).
             'debug'       => ['numeric'], // Specification of this field is optional but if you want to return the list of checkbox fields and the values in them after running this command then add debug=1 as a parameter to this API call. If a code was previously set but was not specified in your mergemultivalues API call then it will show as a DeletedCode value. If a value was not previously set but was specified in your API call, then it will show as an InsertedCode.
         ]));
     }