diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 8f5851c0..570f1d33 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,3 @@
 ### New Features
 
-Implemented create and update Product Variant as this has been missed previously.
+Until BigCommerce decide to be consistent and include a _Get Customer_ endpoint, add `CustomersApi::getById(int $id)`.
diff --git a/src/BigCommerce/Api/Customers/CustomersApi.php b/src/BigCommerce/Api/Customers/CustomersApi.php
index 99ba333b..a976d47c 100644
--- a/src/BigCommerce/Api/Customers/CustomersApi.php
+++ b/src/BigCommerce/Api/Customers/CustomersApi.php
@@ -12,6 +12,7 @@ class CustomersApi extends CustomerApiBase
     use DeleteInIdList;
 
     public const FILTER__EMAIL_IN = 'email:in';
+    public const FILTER__ID_IN = 'id:in';
 
     private const RESOURCE_NAME = 'customers';
 
@@ -33,6 +34,13 @@ public function getByEmail(string $email): ?Customer
         return $customers[0];
     }
 
+    public function getById(int $id): ?Customer
+    {
+        $customers = $this->getAll([self::FILTER__ID_IN => $id])->getCustomers();
+
+        return $customers[0] ?? null;
+    }
+
     public function create(array $customers): CustomersResponse
     {
         return new CustomersResponse($this->createResources($customers));
diff --git a/tests/BigCommerce/Api/Customers/CustomersApiTest.php b/tests/BigCommerce/Api/Customers/CustomersApiTest.php
index 796b6b7b..c22ebb04 100644
--- a/tests/BigCommerce/Api/Customers/CustomersApiTest.php
+++ b/tests/BigCommerce/Api/Customers/CustomersApiTest.php
@@ -12,12 +12,31 @@ public function testCanGetCustomers()
         $this->setReturnData('customers__get_all.json');
         $customersResponse = $this->getApi()->customers()->getAll();
         $this->assertEquals(1, $customersResponse->getPagination()->total);
-        $this->assertEquals('Jan', $customersResponse->getCustomers()[0]->first_name);
+        $this->assertEquals('John', $customersResponse->getCustomers()[0]->first_name);
     }
 
     public function testCanGetCustomerByEmail()
     {
-        $this->markTestIncomplete();
+        $this->setReturnData('customers__get_all.json');
+        $customer = $this->getApi()->customers()->getByEmail('john.smith@spam.me');
+
+        $this->assertEquals('John', $customer->first_name);
+    }
+
+    public function testCanGetCustomerById()
+    {
+        $this->setReturnData('customers__get_all.json');
+        $customer = $this->getApi()->customers()->getById(1);
+
+        $this->assertEquals('john.smith@spam.me', $customer->email);
+    }
+
+    public function testCanGetNullCustomerById()
+    {
+        $this->setReturnData('customers__get_all_no_results.json');
+        $customer = $this->getApi()->customers()->getById(2);
+
+        $this->assertNull($customer);
     }
 
     public function testCanCreateCustomers()
diff --git a/tests/BigCommerce/responses/customers__get_all.json b/tests/BigCommerce/responses/customers__get_all.json
index 13637e01..286d6661 100644
--- a/tests/BigCommerce/responses/customers__get_all.json
+++ b/tests/BigCommerce/responses/customers__get_all.json
@@ -7,9 +7,9 @@
       },
       "company": "Aligent",
       "customer_group_id": 1,
-      "email": "jan.plank@aligent.com.au",
-      "first_name": "Jan",
-      "last_name": "Plank",
+      "email": "john.smith@spam.me",
+      "first_name": "John",
+      "last_name": "Smith",
       "notes": "",
       "phone": "",
       "registration_ip_address": "",
diff --git a/tests/BigCommerce/responses/customers__get_all_no_results.json b/tests/BigCommerce/responses/customers__get_all_no_results.json
new file mode 100644
index 00000000..c326510b
--- /dev/null
+++ b/tests/BigCommerce/responses/customers__get_all_no_results.json
@@ -0,0 +1,12 @@
+{
+  "data": [],
+  "meta": {
+    "pagination": {
+      "total": 0,
+      "count": 0,
+      "per_page": 50,
+      "current_page": 1,
+      "total_pages": 1
+    }
+  }
+}