Wing uses Stripe to handle all aspects of user payments concerning credit & debit cards. Stripe is a leader in the payments industry and the industry standard for accepting payments online. 

Stripe is a global online payment processor that is trusted by millions of businesses across the globe. Just some of Stripe's customers include Uber, Instacart, Slack, Target, Salesforce, Twitch, Amazon, Nasdaq, Reddit, DoorDash, Shopify, Yelp, OpenTable, Expedia, Spotify. Almost every online business that has an element of payments relies on Stripe. See Stripe's Customers Here.

Regarding security at Stripe, here is an excerpt from their website:

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. To accomplish this, we make use of best-in-class security tools and practices to maintain a high level of security at Stripe.


All data in and out of Wing is encrypted using HTTPS, and information stored by Wing is encrypted using bank-level security. Wing does not ever come into possession of your credit card information, we offset all knowledge and handling of your payment information to Stripe. Here is an excerpt from Stripe's website on how Stripe stores your credit card information.

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 are able to obtain plaintext card numbers; instead, they can just request that cards be sent to a service provider on a static whitelist. Stripe’s infrastructure for storing, decrypting, and transmitting card numbers runs in separate hosting infrastructure, and doesn’t share any credentials with Stripe’s primary services (API, website, etc.).


Stripe also forces the use of HTTPS for all of its inbound and outbound communications, here is an excerpt from Stripe's website on how they handle inbound and outbound communications

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
We regularly audit the details of our implementation: the certificates we serve, the certificate authorities we use, and the ciphers we support. We use HSTS to ensure browsers interact with Stripe only over HTTPS. Stripe is also on the HSTS preloaded lists for both Google Chrome and Mozilla Firefox.