Short answer: keep an invitation in a pending state, verify the claimant's identity, and create the...
Short answer: keep an invitation in a pending state, verify the claimant's identity, and create the user record only after that proof succeeds. For a B2B SaaS product, make the same state machine own deletion: a GDPR delete must revoke every session before the account disappears.
Here is the decision note I use when reviewing an invite flow. It is deliberately boring. Boring auth survives audits.
Strength
Cost
Best fit
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Why naive SDK implementations burn engineering budgets, and how to build a pre-validation state machine to stop useless API calls.
