Private shipping app with multi carrier services

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I have  created a private App to handle standard Royal Mail shipping. It works like a dream.

I use the Slince library.

However, is it possible to create another carrier service using the same App?

When i try to create the new carrier service I get this error message.

Client error: `POST https://dj-mag-shop.myshopify.com/admin/carrier_services.json` resulted in a `422 Unprocessable Entity` response: {"errors":{"base":["Royal Mail is already configured"]}} in Slince\Shopify\Client->sendRequest() 

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