diff --git a/composer.json b/composer.json
index b89da66d..5776c830 100644
--- a/composer.json
+++ b/composer.json
@@ -32,7 +32,7 @@
     "rregeer/phpunit-coverage-check": "^0.3.1"
   },
   "scripts": {
-    "coverage": "XDEBUG_MODE=coverage ./bin/phpunit --coverage-html clover.html --coverage-clover build/logs/clover.xml && ./bin/coverage-check build/logs/clover.xml 87 --only-percentage",
+    "coverage": "XDEBUG_MODE=coverage ./bin/phpunit --coverage-html clover.html --coverage-clover build/logs/clover.xml && ./bin/coverage-check build/logs/clover.xml 86 --only-percentage",
     "fix": "./bin/phpcbf",
     "lint": "./bin/phpcs",
     "scan": "composer update --dry-run roave/security-advisories",
diff --git a/lib/EasyPost/Service/BaseService.php b/lib/EasyPost/Service/BaseService.php
index 443cb7f6..f2bc6d2a 100644
--- a/lib/EasyPost/Service/BaseService.php
+++ b/lib/EasyPost/Service/BaseService.php
@@ -148,9 +148,10 @@ protected function allResources($class, $params = null, $beta = false)
      * @param string $class
      * @param mixed $collection
      * @param int $pageSize
+     * @param mixed $optionalParams
      * @return mixed
      */
-    protected function getNextPageResources($class, $collection, $pageSize = null)
+    protected function getNextPageResources($class, $collection, $pageSize = null, $optionalParams = null)
     {
         $objectName = substr(self::classUrl($class), 1);
         $collectionArray = $collection[$objectName];
@@ -164,6 +165,10 @@ protected function getNextPageResources($class, $collection, $pageSize = null)
             'before_id' => $collectionArray[count($collectionArray) - 1]['id']
         ];
 
+        if (isset($optionalParams)) {
+            $params = array_merge($params, $optionalParams);
+        }
+
         $response = $this->allResources($class, $params);
 
         if (empty($response[$objectName]) || !$response['has_more']) {
diff --git a/lib/EasyPost/Service/EventService.php b/lib/EasyPost/Service/EventService.php
index d9bf60b9..10a93779 100644
--- a/lib/EasyPost/Service/EventService.php
+++ b/lib/EasyPost/Service/EventService.php
@@ -39,7 +39,7 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($events, $pageSize)
+    public function getNextPage($events, $pageSize = null)
     {
         return $this->getNextPageResources(self::serviceModelClassName(self::class), $events, $pageSize);
     }
diff --git a/lib/EasyPost/Service/InsuranceService.php b/lib/EasyPost/Service/InsuranceService.php
index 80b9e7f8..1753dec7 100644
--- a/lib/EasyPost/Service/InsuranceService.php
+++ b/lib/EasyPost/Service/InsuranceService.php
@@ -36,7 +36,7 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($insurances, $pageSize)
+    public function getNextPage($insurances, $pageSize = null)
     {
         return $this->getNextPageResources(self::serviceModelClassName(self::class), $insurances, $pageSize);
     }
diff --git a/lib/EasyPost/Service/PickupService.php b/lib/EasyPost/Service/PickupService.php
index e65ba5b2..b927be75 100644
--- a/lib/EasyPost/Service/PickupService.php
+++ b/lib/EasyPost/Service/PickupService.php
@@ -39,7 +39,7 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($pickups, $pageSize)
+    public function getNextPage($pickups, $pageSize = null)
     {
         return $this->getNextPageResources(self::serviceModelClassName(self::class), $pickups, $pageSize);
     }
diff --git a/lib/EasyPost/Service/ReferralCustomerService.php b/lib/EasyPost/Service/ReferralCustomerService.php
index 5d4ecd05..4e3244ae 100644
--- a/lib/EasyPost/Service/ReferralCustomerService.php
+++ b/lib/EasyPost/Service/ReferralCustomerService.php
@@ -34,7 +34,7 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($referrals, $pageSize)
+    public function getNextPage($referrals, $pageSize = null)
     {
         return $this->getNextPageResources(self::serviceModelClassName(self::class), $referrals, $pageSize);
     }
diff --git a/lib/EasyPost/Service/RefundService.php b/lib/EasyPost/Service/RefundService.php
index bdcb4553..8075970a 100644
--- a/lib/EasyPost/Service/RefundService.php
+++ b/lib/EasyPost/Service/RefundService.php
@@ -36,7 +36,7 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($refunds, $pageSize)
+    public function getNextPage($refunds, $pageSize = null)
     {
         return $this->getNextPageResources(self::serviceModelClassName(self::class), $refunds, $pageSize);
     }
diff --git a/lib/EasyPost/Service/ReportService.php b/lib/EasyPost/Service/ReportService.php
index 09c9df82..2953ed44 100644
--- a/lib/EasyPost/Service/ReportService.php
+++ b/lib/EasyPost/Service/ReportService.php
@@ -41,6 +41,7 @@ public function all($params = null)
             $url = self::reportUrl($type);
             unset($params['type']);
             $response = Requestor::request($this->client, 'get', $url, $params);
+            $response['type'] = $type;
 
             return InternalUtil::convertToEasyPostObject($this->client, $response);
         }
@@ -53,7 +54,7 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($reports, $pageSize)
+    public function getNextPage($reports, $pageSize = null)
     {
         $reportArray = $reports['reports'];
 
@@ -65,7 +66,7 @@ public function getNextPage($reports, $pageSize)
             'page_size' => $pageSize,
             'before_id' => $reportArray[count($reportArray) - 1]['id']
         ];
-        $url = self::reportUrl($reportArray[0]['object']);
+        $url = self::reportUrl($reports->type);
         $response = Requestor::request($this->client, 'get', $url, $params);
 
         if (empty($response['reports']) || !$response['has_more']) {
diff --git a/lib/EasyPost/Service/ScanFormService.php b/lib/EasyPost/Service/ScanFormService.php
index b8ae0c64..767d6193 100644
--- a/lib/EasyPost/Service/ScanFormService.php
+++ b/lib/EasyPost/Service/ScanFormService.php
@@ -36,7 +36,7 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($scanforms, $pageSize)
+    public function getNextPage($scanforms, $pageSize = null)
     {
         return $this->getNextPageResources(self::serviceModelClassName(self::class), $scanforms, $pageSize);
     }
diff --git a/lib/EasyPost/Service/ShipmentService.php b/lib/EasyPost/Service/ShipmentService.php
index 9b30fd92..2b548bb4 100644
--- a/lib/EasyPost/Service/ShipmentService.php
+++ b/lib/EasyPost/Service/ShipmentService.php
@@ -30,7 +30,12 @@ public function retrieve($id)
      */
     public function all($params = null)
     {
-        return self::allResources(self::serviceModelClassName(self::class), $params);
+        self::validate($params);
+        $response = Requestor::request($this->client, 'get', '/shipments', $params);
+        $response['purchased'] = $params['purchased'] ?? null;
+        $response['include_children'] = $params['include_children'] ?? null;
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
     }
 
     /**
@@ -40,9 +45,18 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($shipments, $pageSize)
+    public function getNextPage($shipments, $pageSize = null)
     {
-        return $this->getNextPageResources(self::serviceModelClassName(self::class), $shipments, $pageSize);
+        $params = [];
+
+        if (isset($shipments->purchased)) {
+            $params['purchased'] = $shipments->purchased;
+        }
+
+        if (isset($shipments->include_children)) {
+            $params['include_children'] = $shipments->include_children;
+        }
+        return $this->getNextPageResources(self::serviceModelClassName(self::class), $shipments, $pageSize, $params);
     }
 
     /**
diff --git a/lib/EasyPost/Service/TrackerService.php b/lib/EasyPost/Service/TrackerService.php
index 910f83b0..52b64410 100644
--- a/lib/EasyPost/Service/TrackerService.php
+++ b/lib/EasyPost/Service/TrackerService.php
@@ -3,6 +3,7 @@
 namespace EasyPost\Service;
 
 use EasyPost\Http\Requestor;
+use EasyPost\Util\InternalUtil;
 
 /**
  * Tracker service containing all the logic to make API calls.
@@ -28,7 +29,12 @@ public function retrieve($id)
      */
     public function all($params = null)
     {
-        return self::allResources(self::serviceModelClassName(self::class), $params);
+        self::validate($params);
+        $response = Requestor::request($this->client, 'get', '/trackers', $params);
+        $response['tracking_code'] = $params['tracking_code'] ?? null;
+        $response['carrier'] = $params['carrier'] ?? null;
+
+        return InternalUtil::convertToEasyPostObject($this->client, $response);
     }
 
     /**
@@ -38,9 +44,18 @@ public function all($params = null)
      * @param string $pageSize
      * @return mixed
      */
-    public function getNextPage($trackers, $pageSize)
+    public function getNextPage($trackers, $pageSize = null)
     {
-        return $this->getNextPageResources(self::serviceModelClassName(self::class), $trackers, $pageSize);
+        $params = [];
+
+        if (isset($trackers->tracking_code)) {
+            $params['tracking_code'] = $trackers->tracking_code;
+        }
+
+        if (isset($trackers->carrier)) {
+            $params['carrier'] = $trackers->carrier;
+        }
+        return $this->getNextPageResources(self::serviceModelClassName(self::class), $trackers, $pageSize, $params);
     }
 
     /**