API keys and OAuth are common ways to authorize software integrations, but they represent different access patterns. An API key is usually a secret credential associated with an application or account; OAuth lets a user or service authorize an application with defined permissions. The right choice depends on how access must be limited and managed.
How API keys are commonly used
An API key can be straightforward for a server-to-server integration or a narrowly scoped service. Its permissions depend on the provider’s implementation; some keys grant broad access, while others can be restricted by product, environment, or allowed actions.
Treat a key like a password: store it in a secrets manager, keep it out of source code and logs, restrict who can read it, and rotate it when exposure is suspected or ownership changes. A leaked key may continue working until it is disabled.
How OAuth authorization differs
OAuth separates the user or service granting access from the application using it. The authorization flow can issue tokens with selected scopes and lifetimes, and users or administrators may be able to revoke the grant without changing a shared account password.
OAuth is not automatically safer if scopes are too broad, refresh tokens are poorly protected, or the integration has weak operational controls. Review the requested permissions and the provider’s revocation and token-expiry behavior.
Choose the pattern for the integration
Use the provider’s recommended method and ask whether access should belong to a user, a service account, or a single integration. Prefer least privilege, separate production from testing, and assign an owner who can respond when credentials expire or staff leave.
An OAuth grant can be a better fit for delegated access across users or organizations. A restricted API key can be suitable for a controlled service connection. Avoid copying credentials into spreadsheets, campaign notes, or browser-visible code.
Plan recovery and auditability
Record the system, purpose, owner, permissions, creation date, and rotation or review schedule. Test what happens when access is revoked, a token expires, or the integration receives insufficient scope. Monitor failures so a credential issue does not silently break lead routing or reporting.
Security depends less on the label and more on permission scope, secret handling, revocation, and ownership.
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