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Linking question with scripts

I am using a service called Snappy Checkout to process credit cards.

Currently, I am having to add the link manually outside of webflow and was wondering if I could do it
within instead. They do offer an embed button, but I don’t like the style of it so would like to use my own.

Here is the code that they supply:

<A HREF="#" ONCLICK="Checkout.loadButton('XXXXXXXXXXXXXXXXXXXXX',''); return false;">Open</A>

Is there a way to do this from within weblfow?