All payments made using the card are processed through the electronic payment platform of “Stripe”. “Stripe’ has been audited by a PCI-certified auditor and is certified to PCI Service Provider Level 1. This is the most stringent level of certification available in the payments industry.
HTTPS and HSTS for secure connections
Stripe forces HTTPS for all services using TLS (SSL), including our public website and the Dashboard.
Stripe.js is served only over TLS
Stripe’s official libraries connect to Stripe’s servers over TLS and verify TLS certificates on each connection
‘Stripe’ regularly audits the details of its implementation, including the certificates served, the certificate authorities used, and the ciphers supported. “Stripe” uses HSTS to ensure that browsers interact with ‘Stripe” only over HTTPS. Stripe is also on the HSTS preloaded lists for both Google Chrome and Mozilla Firefox.
Encryption of sensitive data and communication
All card numbers are encrypted at rest with AES-256. Decryption keys are stored on separate machines. None of Stripe’s internal servers and daemons can obtain plaintext card numbers but can request that cards are sent to a service provider on a static allowlist. Stripe’s infrastructure for storing, decrypting, and transmitting card numbers runs in a separate hosting environment, and doesn’t share any credentials with Stripe’s primary services (API, website, and so on).
You may find more here: https://stripe.com/docs/security/stripe