I'm having trouble with PayPal

You can use an alternate PayPal gateway if PayPal keeps giving you trouble. (Needs a new credit card, even if you have a verified credit card on account, things like that)

To use the alternate API:

1- login to your put.io account
2- visit this url: http://www.put.io/account/paymentmethod/m/1
this will switch your payment gateway to PayPal Website Payments Standart
3- pick a plan and try PayPal again.

Or if you don't have a put.io account yet, register using this URL: http://put.io/register/wps