To add onto what Amanda said, if you're explicitly looking at adding a PayPal button to a landing page, this will somewhat vary by landing page. Lead Generation LPs don't really offer a way to insert a button / image anywhere on the page (beyond the default logo at the top). Shoppable LPs and especially Custom LPs offer more flexibility and customization in elements. The same principle as what was described in Amanda's article would also apply to these pages, you just need a PayPal icon image as provided in the article and the proper URL for your PayPal subscription, and you can insert those as needed into your LP.
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