Neither Cardknox nor Airpay offers a free trial.
Cardknox is designed for Freelancers, Medium Business and Small Business.
Airpay is designed for Large Enterprises and Medium Business.
Pricing details for both Cardknox and Airpay are unavailable at this time. Contact the respective providers for more information.
Some top alternatives to Cardknox includes Stripe Payments, PaymentSpring, Authorize.Net, EBS, Stripe Connect, UniPay Gateway, EBizCharge, Airpay, Better Payment and aPay Payment Gateway Systems.
Some top alternatives to Airpay includes PayU, Instamojo, Paytm Payment Gateway, India Online Pay, MultiSafepay, UniPay Gateway, NextPay Payment Gateway, Better Payment and aPay Payment Gateway Systems.