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how to develop using XFBML ?


With some investigation of how to use "like button" of facebook in my website, I have found that I could use XFBML language and its SDK, finally there is an option to register my application in order to have an ID, so do I need to pay for an APP ID ?
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The application API key is used to have a trusted connection from the website using the API to the Facebook server; it is a common technique to use such keys to prevent unauthorized applications from access i.e. Google uses it in their Google Maps API and in Google Analytics.

Register your application here:

A nice tutorial can be found here:

... and the FB developer pages should also be worth reading:

Good luck!
dimensionavAuthor Commented:
During registration I got a message that says that I have to verify my account giving my mobile phone or my credit card, is this because is going to be charged?... I have to mention that there isnĀ“t my country in the list (for a mobile device verification).
Registering an application is free, the credit card or phone number is merely used to verify you're a real human person and it's most likely a back insurance in case your application causes problems on Facebook, i.e. through spying on personal data.

I also found the following blog article about the new developer registration process on the Dev blog:

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