How to add script to Additional scripts under checkout in storefront settings

Shopify Partner
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I am hosting my own script on my own server. Now the link changes after certain moments. Also it's not a good idea to change every time from the settings. So, I have a front end so that merchants can easily change/add/remove the script. Now I need a API that can access the storefront and change the additional script. Is there anything available or something else for suggestion. 

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