Payment link
You set the amount when you create the link. Opening it starts a hosted checkout for that amount. The person paying cannot change it. A link can include a QR code. It is not a store connection.
Payment links
A link for the amount, or a request to one customer.
A payment link is reusable. A payment request is one amount for one customer, and it does not create an invoice. The customer pays by card on the hosted page.
Payment button
The same link can sit on your site as a button. The amount still comes from the link, not from the browser.
Payment request
A request is an amount, a description, and a customer or an email. You can set an expiration. Cancel it and the link stops working. It does not create an invoice.
Share an amount today.
Test mode does not move real money. Live payments start after your business is approved.