How to sell through Square from a separate mobile friendly website?

[Tamlyn]

Hello - I'm hoping someone can help me figure out how to use Square for sales from a separate mobile friendly website (buttons to embed into our website pages or links to purchase options?). We are currently using PayPal but my client wants to switch to Square. However the website is already built and I don't want to have to charge her to create a new website at Square. Suggestions and help appreciated in advance.