Use HTTPS to ensure secure communication between the app and the Shopify servers.
Use API keys and secure authentication mechanisms to ensure that only authorized users and apps can access sensitive data.
Encrypt sensitive data, both in transit and at rest, to protect customer information
Implement secure user authentication methods to ensure that only authorized users can access the app's functionality.
Implement server-side validation to ensure that data submitted to the app is accurate and secure.
App involves payment processing, adhere to PCI DSS (Payment Card Industry Data Security Standard) compliance standards.