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Telldus Live API requires PEAR::HTTP_OAuth to be installed.

Can you guys recommend a hosting company which delivers a web hotel with PEAR::HTTP_OAuth preinstalled?

You can install in yourself in your application. It is not required to be installed globally on the machine. So any hosting company with support for php should suffice.

There is also other OAuth libraries available. You are not required to use just PEAR::HTTP_OAuth.