Where do you want to show the button?
Shopify has dynamic buttons, you can configure it on your payment methods, you can find more information here: https://help.shopify.com/en/manual/sell-online/online-store/dynamic-checkout
Elias here with Shopify Support. Thank you for reaching out.
I’ve taken a look at your website and was able to see the PayPal button on the product page. Shopify themes and third-party themes from our Theme Store will have the PayPal accelerated checkout buttons integrated once you set up PayPal on your store. However, I can’t say for sure for custom-built themes. If you’re using a custom theme, you may need a developer to code this function. Or, were you trying to embed the PayPal button for a different sales channel (eg. Buy Buttons)?
Here’s what I am seeing on your website:
Let me know if this helps clarify the PayPal button. If you have any other questions on PayPal, don’t hesitate to let me know in this thread!
Thank you for following up and clarifying the request. I'm afraid adding custom PayPal buttons falls outside the scope of our Theme Support as indicated in our design policy. That said, you can try to edit your theme's coding and paste the custom PayPal button to your theme. Before making any changes to your theme, I recommend duplicating your theme and making a copy so that you can easily revert your theme if the custom coding doesn’t work.
Was there a specific reason that you don't want to use the integrated PayPal and accelerated checkout buttons?