Mailchimp rest api - rest

I've started working with MailChimp's api.
I've tried connecting to their servers using a rest call
based on a sample code I've found somewhere:
http://api.mailchimp.com/1.3/?output=json&method=campaignTemplateContent&apikey=MyKey-us2&cid=myId
Unfortounatly I keep getting this error:
{"error":"Invalid Mailchimp API Key: **MyKey**-us2 . You are accessing the wrong datacenter - your client library may not properly support our datacenter mapping scheme.","code":104}
I can't find any other code samples working on MailChimp's rest api.
What am I doing wrong here? Where are the code samples?
Thanks

Your URL is incorrect. You should be hitting http://us2.api.mailchimp.com instead of the one you're using.

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Here is an example of using Binanace's API, which works well:
https://api.bscscan.com/api
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Why is that working but mine not working?
I would highly suggest using Postman, which you can use to quickly test requests. I ran your request, with api-key, through Postman and was able to get a 200 response with data. See this screenshot.
Please note I blanked out the api key value. I suggest you do the same in your post unless its fake.
I had to remove the line breaks in the code you pasted. Could this possibly be the issue?

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It seems that the frontend API of OpenRouteService receives the GET requests correctly, but after it builds the request in xml and relays it to the backend server the server fails to validate the request correctly. It should be a problem with the backend server.
The frontend php code is here for reference.
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