Best captive portal for hotspot system

am planing to create city wifi ,but i need help which captive portal should i use am planing to use pfsense , but i want to know all the need information , how to create voucher card ,creating sms
and buying voucher online .

thank you

I am not sure what your question is, but you can see all the options here:
And Netgate has an in depth video here:

As for the payments, that is not interrelated into pfsense, you would have to use a third party option.