是否有可能创建一个动态的PayPal支付链接？

I'll be serving this via PHP, so it'll be more difficult to hijack. It's a temporary solution that'll be manually reviewed, so I'm not particularly worried about security. But, I was wondering if it's possible to create a link that would work with variables? Something like this:

https://paypal.com/pay?type=link&price=55aud&item=coffee

After thoroughly searching PP's API documentation I can't find anything of the type.

Of course. You just need to build your string dynamically with PHP. For example, using your link sample, we might end up with something like this:

$price = 55;
$item = 'coffee';
$currency_code = 'aud';

$paypal_url = 'https://paypal.com/pay?type=link&price='.$price.'&currency_code='.$currency_code.'&item='.$item;

Of course, you could use static variables like I did here, or you could load the URL items with session variables, database data, etc. Once the URL is prepared you can output it and attach it to a link, button, simply redirect straight to it, or whatever you need to do.