Help with Stripe payment processing

Hi
1. we sell car insurance
2. To sell car insurance, we have a webform which customers fill in and submit
3. Webform runs on zoho forms
4. Webform has integration with stripe so that customers can pay us for their insurance
5. The integration runs on a webhook programmed in stripe
6. We require that customer's credit card details are saved in stripe when form is submitted
7. Form is working fine, but credit card details are not saving
8. Need help to program webhook so that credit card details are saved

Thank you