Suppliers can choose to verify the customer ID manually ie just allowing the customer upload the ID during the application process which they can then manually verify.
Alternatively suppliers can verify customer's ID via Equifax ID check which allows customer ID to be verified for a small fee ( c $2 per ID check).
Both processes are secure as 1Centre's security is top notch.
We use a range of industry good practices to protect user data, both in our development process and the configuration of our development infrastructure.
This includes static analysis tools, HTTPS providing private connections when communicating with the web application, and using well established libraries. Our production infrastructure uses databased encrypted at rest.