Adsense code

Could somebody please clarify what Adsense code is required in able to order ads.

I have created my account with Google and the following code has been given:

<script data-ad-client="ca-pub-xxxxxxxxxxxxxxxx" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>

When I search these forums I see that others have used :

Code:

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<ins...

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source https://xfworld.net/threads/adsense-code.47118/