Category: Customer Identity

Sign-Up Flow

Also known as: Signup Flow, Registration Flow

Simply put

A sign-up flow is the sequence of steps a new user goes through to create an account with a product or service. It typically collects the information needed to establish an identity and, in most deployments, guides the user from first interaction toward using the product. The design of this flow strongly affects how many users complete registration rather than abandoning it.

Formal definition

A sign-up flow is the user-facing process that establishes a new principal's identity record during account registration, forming the initial stage of the identity lifecycle rather than a runtime access-enforcement mechanism. It typically covers identification (collecting user-provided attributes and a unique identifier), credential establishment or enrollment, and may incorporate delegated options such as social login, which in most deployments relies on an OpenID Connect authentication layer over OAuth 2.0 to federate identity from an external provider; the exact steps, verification requirements, and downstream provisioning vary by deployment and product context. Note that the term as described in the evidence is oriented toward the customer/user onboarding experience and drop-off reduction; details such as identity proofing, attribute verification, and back-end provisioning (for example via SCIM) are out of scope of the cited sources and depend on configuration.

Why it matters

The sign-up flow is the entry point to the identity lifecycle, and its design directly determines whether prospective users complete registration or abandon it. Because it is often a new user's first interaction with a product or brand, friction introduced at this stage, excessive fields, confusing steps, or a registration process indistinguishable from login, can cause drop-off before an identity record is ever established. Guidance in the cited sources emphasizes reducing this friction through practices such as limiting sign-up to a single page, keeping the flow simple, and clearly differentiating it from the log-in experience.

Beyond conversion, the sign-up flow matters because it is where a principal's initial identity record is created, setting the foundation for everything that follows in the lifecycle. Choices made here, for example whether to offer delegated or social sign-up options, shape how identity is established and how the user moves toward a meaningful product outcome. Some sources frame the modern goal as routing a new user to a real product outcome within the first session rather than simply capturing an account.

It is important to keep the scope of this term precise: the cited evidence is oriented toward the customer and user onboarding experience and toward reducing abandonment, not toward runtime access enforcement. Concerns such as identity proofing, attribute verification, and back-end provisioning are out of scope of these sources and depend heavily on deployment configuration, so the sign-up flow should be understood as the registration-experience stage of the identity lifecycle rather than a complete account-establishment or verification pipeline.

Who it's relevant to

Product and UX designers

Those responsible for the onboarding experience own the design decisions that determine completion versus abandonment. The cited best practices, limiting sign-up to one page, keeping it simple, differentiating it from log-in, offering linked or social sign-up, and adding a welcome step, are primarily design-level levers they can apply to reduce drop-off.

IAM engineers and architects

Engineers integrating delegated or social sign-up need to implement it correctly. Where social login is used, it typically relies on an OpenID Connect authentication layer over OAuth 2.0 to federate identity from an external provider, so architects must treat this as authentication built on a delegated authorization framework rather than as OAuth 2.0 authentication on its own.

Identity lifecycle and CIAM owners

Teams managing customer identity and access see the sign-up flow as the initial stage of the identity lifecycle, where a new principal's identity record is first created. They should note that identity proofing, attribute verification, and back-end provisioning are separate concerns not covered by the onboarding-focused guidance here and depend on deployment configuration.

Growth and conversion stakeholders

Because the sign-up flow is often a user's first interaction with the product, its design strongly affects how many users complete registration and reach a product outcome. Stakeholders focused on activation care about reducing drop-off and, per some cited guidance, routing new users toward a real outcome within the first session.

Inside Sign-Up Flow

Identification and Attribute Collection

The initial step where a prospective user provides identifying attributes (for example email, username, phone number) and any profile data the service requires. This establishes a claimed identity that has not yet been verified, and should be kept distinct from the subsequent authentication and authorization steps.

Credential Establishment

The creation of the credential the user will later present to authenticate. Depending on configuration this may be a knowledge factor (password), a possession/inherence-based passwordless credential such as a FIDO2/WebAuthn passkey, or a combination. Establishing a credential during sign-up is separate from verifying identity ownership.

Identity Proofing and Verification

Steps that validate the claimed attributes actually belong to the person signing up, such as email or phone verification, or higher-assurance document checks. The rigor typically varies by risk tolerance and regulatory context, and email/phone verification alone is a low-assurance proofing measure rather than strong identity proofing.

Account Provisioning

The creation of the user record in the identity store (for example an LDAP directory entry or a database record) and, in federated or downstream systems, potential propagation via SCIM provisioning. This is an identity lifecycle/administration concern rather than a runtime access-enforcement concern.

Consent and Policy Acknowledgment

Capture of user consent to terms, privacy notices, and, where applicable, data processing. This is often required for compliance and is distinct from authorization decisions about what the account may later access.

Initial Authorization Assignment

The assignment of initial entitlements to the new account, such as a default role under RBAC or baseline attributes evaluated under ABAC/PBAC at runtime. Determining what the new principal may do is a separate step from authenticating that principal.

Common questions

Answers to the questions practitioners most commonly ask about Sign-Up Flow.

Is a sign-up flow the same thing as a sign-in (authentication) flow?

No. A sign-up flow is the registration process that establishes a new identity and typically creates the associated account record and initial credentials. A sign-in flow authenticates an already-existing principal. The two are distinct steps: registration performs identification and credential enrollment, whereas authentication later verifies the returning principal. Some deployments combine them in the user experience (for example, a single button that registers or signs in via a federated provider), but conceptually they remain separate operations.

Does using OAuth 2.0 or a 'Sign up with Google' button mean the sign-up flow is authenticating the user?

Not by itself. OAuth 2.0 is a delegated authorization framework and does not authenticate users on its own. When a sign-up flow uses a federated 'Sign up with...' option, the user authentication is typically handled by OpenID Connect (the authentication layer built on OAuth 2.0), which returns an ID token containing identity claims. The sign-up flow then uses those claims to provision a local account. Describing the OAuth 2.0 authorization grant alone as authenticating the user conflates authorization with authentication.

How should credentials be enrolled during sign-up when supporting passwordless or passkeys?

In most deployments, credential enrollment during sign-up depends on the chosen factor types. For passwordless approaches using passkeys, enrollment typically involves a WebAuthn registration ceremony that creates a FIDO2 credential bound to the relying party, with the resulting public key stored against the new account. This differs from enrolling a knowledge factor such as a password. Note that FIDO2, WebAuthn, and passkeys are related but not interchangeable: WebAuthn is the registration/authentication API, FIDO2 is the broader specification set, and a passkey is a discoverable credential. Exact enrollment behavior varies by platform and authenticator.

How is a newly registered account provisioned into downstream systems?

Provisioning of a newly registered account is an identity governance and administration (IGA) concern rather than a runtime enforcement one. Depending on architecture, the sign-up flow may write directly to a directory (for example via LDAP) or trigger downstream provisioning through SCIM to connected applications. Some deployments defer provisioning to an asynchronous workflow that also applies initial role or attribute assignments. Keep this lifecycle step separate from later runtime authorization decisions made at enforcement points.

What identity verification should occur during sign-up before granting access?

This depends on the assurance requirements of the deployment. Many sign-up flows include an email or phone verification step to confirm control of a claimed contact address before activation, and higher-assurance contexts may add identity proofing or document verification. These verification steps are part of establishing the identity during registration and are distinct from the authentication that occurs on subsequent sign-in. The appropriate level and out-of-scope items should be defined by the relying party's risk and compliance posture.

How should initial authorization be assigned to a newly created account?

Initial authorization assignment during sign-up depends on the access control model in use. In an RBAC deployment, new accounts are typically granted a default role or minimal role set; in ABAC or PBAC deployments, initial attributes or policy-relevant claims are set so that a policy decision point can later evaluate access. Assigning entitlements at sign-up is a governance and administration activity, while the actual access decision is made at runtime by the enforcement components. Applying least privilege and any segregation-of-duties constraints at this stage is common, though specifics vary by configuration.

Common misconceptions

Verifying a user's email or phone during sign-up proves their identity.

Email or phone verification confirms control of a communication channel, which is a relatively low-assurance proofing signal. It does not by itself establish that the claimed real-world identity belongs to the person, and stronger identity proofing typically requires additional evidence depending on risk and regulatory requirements.

Sign-up completes authentication, so the user is authenticated as part of registering.

Sign-up establishes a claimed identity and a credential; authentication is the later act of verifying that credential when the user signs in. Some flows immediately authenticate the user after registration for convenience, but the two steps remain conceptually distinct.

Assigning a default role during sign-up is an authentication decision.

Assigning entitlements (a default role under RBAC, or attributes evaluated by ABAC/PBAC) is an authorization concern determining what the account may do. It should not be conflated with authentication, which only establishes who the principal is.

Best practices

Keep identification, credential establishment, and identity proofing as clearly separated steps, and calibrate the proofing rigor to the risk level and any applicable regulatory requirements rather than treating email or phone verification as strong proofing.

Offer or default to phishing-resistant, passwordless credentials such as FIDO2/WebAuthn passkeys where feasible, while making the assurance level of each credential option explicit in your design.

Treat account provisioning as an identity lifecycle concern: create records in the directory or identity store cleanly and, where downstream systems are involved, use standards-based provisioning such as SCIM rather than ad hoc propagation.

Assign only least-privilege baseline entitlements at sign-up (for example a minimal default role) and defer elevated access to later, reviewable authorization decisions.

Capture and record consent and policy acknowledgments explicitly to support compliance, keeping this audit trail distinct from runtime authorization data.

Apply configurable anti-abuse and verification controls (for example rate limiting and channel verification) at sign-up, and document which controls are in scope so operators understand the assurance the flow does and does not provide.