Tradedoubler - how to verify website

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Hi all, I recently subscribed a publisher account on Tradedoubler. TD asks me to verify the property of the website by:

1-placing a small code in the <head>--</head> tags of the homepage

2-by creating an empty 3707579.html (I used a fake number) file in the root.

For number 1 I placed the code at the top of Sections->header.liquid . I don't know if it is correct.

For number 2, I honestly don't know how to do that on Shopify.

How can I verify the website ownership? Does tradedoubler have a specfic procedure for Shopify?