Need to validate in billing address fields

Envato Customers Purchases and Subscriptions
1

Need to validate in billing address fields like name should be alphabetic and zip code should be numeric only six digits

2

Hi,

Contact with your purchase item author hope they will help you out from your issue.

Thanks!

3

I have already purchased Learts theme, In this e-commerce theme Need to validate billing address fields like the name should be alphabetic and zip code should be numeric only six digits.