Payments for the application forms would be made through Zipcash which enables payments via your mobile phone.
Using Zipcash is possibly as secure as payments can get for multiple reasons:

• Every transaction has to be authorised by your PIN which is known only to you
• Your PIN needs to be sent from your very mobile number and not some other thereby ensuring that you are the one authorizing the transaction
• Incoming bills have a unique number, and you need to enter the unique bill number AND your PIN to complete the transaction