This document is an aggregation of several questions which may help determine the architecture that fits your application and users best.
With the CustomAuth integration, you can select a combination of logins from this list. There are some nuances with certain login providers, so don't hesitate to get in touch.
You can choose to connect logins with the same verifierID. For example if a user uses generic email logins and a gmail login to login on different occasions he/she can still retrieve the same key. This can only be done on logins which share a common unique identifier for a user. Read more about aggregating logins.
CustomAuth is compatible on both web, mobile, native and even CLI applications, which means developers can integrate its key management solutions regardless of their specific infrastructure of choice. It is important to ensure that all platforms in which the key is access are front-end/client side device, in most cases.
The small API surface also means CustomAuth is composable - you can combine it with a meta-transaction flows, multisigs, and other cryptographic protocols. Its easy to build ontop of and generally we fit with most other technology stacks, including but not limited to; your flavour scalability solutions, meta transactions, smart contract wallets, different elliptic curve pairs and even RSA.
Also checkout Compatibility and Common Patterns for more on inspiration on how to use CustomAuth.