Payments

To purchase on our website, you have several payment methods available. We accept payments with:

 

  • AMERICAN EXPRESS

 

  • MASTERCARD

 

  • VISA

 

  • APPLE PAY

 

  • WECHAT PAY

 

  • PAYPAL

 

GRETL Z. always guarantees its customers maximum security during transactions. We operate exclusively through an HTTPS protocol and TLS (SSL) certificates.

 

GRETL Z. 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 card numbers are encrypted at rest with AES-256. Decryption keys are stored on separate machines. None of GRETL Z.'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.

GRETL Z.'s infrastructure for storing, decrypting, and transmitting card numbers runs in separate hosting infrastructure, and doesn’t share any credentials with GRETL Z.'s primary services (API, website, etc.).

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