Add SWISH_URL in config

Co-authored-by: vinkla <[email protected]>

README.md

@@ -25,7 +25,13 @@ You will need to have access to your Swish-certificates to use this package in p
 
 Read more about testing in their MSS-environment in their [official documentation](https://developer.swish.nu/documentation/environments#merchant-swish-simulator). A quick rundown on using/creating Swish-certificates [is published here](https://marcusolsson.me/artiklar/hur-man-skapar-certifikat-for-swish) (in Swedish).
 
-When creating the client, you will have to set which environment you are working with (otherwise it defaults to the production environment, `https://cpc.getswish.net/swish-cpcapi/api/`), you may use `Client::TEST_ENDPOINT` and `Client::PRODUCTION_ENDPOINT` for this:
+When creating the client, you will have to set which environment you are working with (otherwise it defaults to the production environment, `https://cpc.getswish.net/swish-cpcapi/api/`), you may use any of the following options:
+
+``` php
+Client::TEST_ENDPOINT // https://mss.cpc.getswish.net/swish-cpcapi/api/
+Client::PRODUCTION_ENDPOINT // https://cpc.getswish.net/swish-cpcapi/api/
+Client::SANDBOX_ENDPOINT // https://staging.getswish.pub.tds.tieto.com/swish-cpcapi/api/
+```
 
 ``` php
 use Olssonm\Swish\Certificate;
@@ -63,7 +69,7 @@ return [
         'signing' => env('SWISH_SIGNING_CERTIFICATE_PATH', null),
         'signing_password' => env('SWISH_CLIENT_SIGNING_PASSWORD', null),
     ],
-    'endpoint' => \Olssonm\Swish\Client::PRODUCTION_ENDPOINT,
+    'endpoint' => env('SWISH_URL', \Olssonm\Swish\Client::PRODUCTION_ENDPOINT),
 ];
 ```
 

config/swish.php

@@ -8,5 +8,5 @@
         'signing' => env('SWISH_SIGNING_CERTIFICATE_PATH', null), // Optional, used for payouts
         'signing_password' => env('SWISH_SIGNING_CERTIFICATE_PASSWORD', null), // Optional, used for payouts
     ],
-    'endpoint' => \Olssonm\Swish\Client::PRODUCTION_ENDPOINT,
+    'endpoint' => env('SWISH_URL', \Olssonm\Swish\Client::PRODUCTION_ENDPOINT),
 ];

src/Client.php

@@ -31,6 +31,8 @@ class Client
 
     public const TEST_ENDPOINT = 'https://mss.cpc.getswish.net/swish-cpcapi/api/';
 
+    public const SANDBOX_ENDPOINT = 'https://staging.getswish.pub.tds.tieto.com/swish-cpcapi/api/';
+
     protected ClientInterface $client;
 
     public function __construct(