Receipt for credit card transactions

How can I have jotform send an automatic receipt when individuals make payment for credit card transactions? 

Based on the payment processor you're using you and your submitter will receive a receipt from the transaction, this is generating from the payment processor's end. 

You can also set up and customize emails that you can control on your Jotform account, you may include any necessary information in the emails, please check the guides below for more information: 

https://www.jotform.com/help/25-Setting-up-Email-Notifications 

https://www.jotform.com/help/26-Setting-up-an-Autoresponder-Email 

I hope this helps.