Subscription data verification - controls are too weak

[Lada Flac]

System info:
win 7, google chrome Version 38.0.2125.111 m

Steps to reproduce:
MindMup Gold subscription
click on: Pay with debit/credit card
opens page: https://gold.mindmup.com/form/buy_subscription

Description of problems on the form:

1. I am able to enter incorrect email address 'rfgtvbhjn@frvgtbhnj'
2. Name, Address, Postal, City - there is no size limit in these fields or it is abnormaly big (2700 characters successfully saved as a postal code)
3. credit card number: when there are numbers written in the field, writing or deleting a single number in the beginning or in the middle of the field moves the cursor to the end of the field. I need the cursor to stay at the same place because I might enter or delete more than one number.

[Gojko Adzic]

Good catch - unfortunately this is not actionable by us, the control is a third party system (stripe) so we can't fix any form field issues there.