diff --git a/README.md b/README.md
index 030cac2..2a80bc6 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 # A laravel package scaffolding Cash App API.
 
 ## Why Use this Package?
-1. The requests are automatically signed
+
+1. All requests to the Network and Management APIs are automatically [signed](https://developers.cash.app/docs/api/technical-documentation/api-fundamentals/requests/signing-requests).
 
 
 ## Installation
@@ -40,12 +41,22 @@ You can publish the config file with:
 php artisan vendor:publish --tag="laravel-cashapp-config"
 ```
 
-You need to understand the following keys in the config
+You need to understand ande the following keys in the environment variables in your application.
 
 | Key                  | type     | required | default | description                                                                                                                                                                                                                                                                                                                                                |
 |----------------------|----------|----------|---------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `CASHAPP_PRODUCTION` | `boolen` | `false`  | `false` | Determine if production or staging api should be used. The default is `false` to avoid tampering with production api by accident.                                                                                                                                                                                                                          |
 | `CASHAPP_REGION`     | `string` | `false`  | `PDX`   | A character code representing the region closest to where your own services are hosted. Must be [supported regions](https://developers.cash.app/docs/api/technical-documentation/api-fundamentals/requests/regions-and-localization#supported-region--iata-airport-codes). An `InvalidRegionException` exception is thrown if an invalid code is provided. |
+| `CASHAPP_CLIENT_ID`  | `string` | `true`   | `null`  | Here you specify the <client_id> associated with your cash app account.                                                                                                                                                                                                                                                                                    |
+
+
+Example in your `.env`
+```dotenv
+CASHAPP_PRODUCTION=true
+CASHAPP_REGION=ATL #Atlanta, United States
+CASHAPP_CLIENT_ID=CS-CI_ACKIl7VOyOUwAg...
+```
+
 
 ## Usage
 
diff --git a/config/cashapp.php b/config/cashapp.php
index e1a4e36..cbb2d37 100644
--- a/config/cashapp.php
+++ b/config/cashapp.php
@@ -25,6 +25,8 @@
     | The <client id> is use to construct the authorisation header. The
     | client ID can be shared with the customers' browsers or POS.
     |
+    | Starts with `CAS-CI_` for sandbox and `CA-CI_` for production.
+    |
     | @see https://developers.cash.app/docs/api/technical-documentation%2Fapi-fundamentals%2Frequests%2Fmaking-requests#authorization
     |
    */
diff --git a/tests/TestCase.php b/tests/TestCase.php
index aa60173..06fd35a 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -27,7 +27,7 @@ protected function getPackageProviders($app): array
     public function getEnvironmentSetUp($app): void
     {
         config()->set('database.default', 'testing');
-        config()->set('cashapp.client_id', 'ACKIl7VOyOUwAgCzTYF1+B+A9sfq0kIGTy+Z43wENpw=');
+        config()->set('cashapp.client_id', 'CAS-CI_ACKIl7VOyOUwAgCzTYF1+B+A9sfq0kIGTy+Z43wENpw');
 
         /*
         $migration = include __DIR__.'/../database/migrations/create_laravel-cashapp_table.php.stub';