Didit is a practical first KYC provider to evaluate for a custom business application that needs verification connected to an operational workflow. Persona fits complex approval paths, Veriff suits a dedicated identity checkpoint, Sumsub fits broader customer due diligence operations, and Entrust Identity Verification is relevant when identity is part of a coordinated enterprise project.
Custom software often starts with a spreadsheet, a shared inbox and a person who knows how every exception works. Adding a KYC provider does not automatically transfer that knowledge into the application. The project must define who is being checked, why the check is needed and which employee can move the request forward.
This comparison focuses on that handoff. The best provider is the one that supports a clear business process without leaving the application to invent what an incomplete or ambiguous result means.
Five KYC providers and their business application fit
| Provider | Useful starting point | Back-office requirement to clarify |
|---|---|---|
| Didit | Verification flow connected to session review | How evidence becomes an assigned work item |
| Persona | Conditional customer journeys | Which department owns each branch |
| Veriff | Document and biometric identity checking | How the identity result connects to the business request |
| Sumsub | A wider verification and compliance operation | What belongs in the provider versus the custom application |
| Entrust Identity Verification | Multi-stakeholder identity integration | How the process is maintained after handover |
1. Didit: best for connecting onboarding to a working review queue
Didit's console allows reviewers to inspect verification sessions and request selected steps again. For a custom application, that creates a useful distinction between a request that is fundamentally unsuitable and one that simply needs better evidence.
Consider a customer portal where an applicant submits a blurred image. The application should show a corrective action, while the case owner can see what remains outstanding. It should not force staff to start a completely unrelated request just to get a clearer capture.
Keep the business request and verification session connected, but separate. A business request may include a service selection, commercial terms and several people. A session records the checks for a particular person or flow. One record should not silently stand in for the other.
Didit is a strong starting option when the project needs that operational structure without building every review screen from scratch. Decide which employees work in its console and which only need a status in the business application.
The main scope decision is where the final approval happens. If a manager must accept the customer's request after identity checks, make that a distinct action. An approved verification should not accidentally sign a contract, allocate a credit limit or authorise a service the reviewer never considered.
2. Persona: best for applications with several approval owners
Persona provides verification capabilities and workflow automation that can suit applications with different routes through onboarding. This is valuable when a request moves between sales, operations and a specialist reviewer.
Before considering automation, draw the route using actual roles. A salesperson might initiate a request, the customer supplies evidence and an operations manager completes the business decision. Each stage should state what information the next person needs.
Persona becomes especially relevant when those routes vary for a clear reason. For example, an existing account adding an administrator may not follow the same process as a completely new customer. The application needs to recognise the request type before it asks for evidence.
Do not hide business exceptions in individual employee accounts. A rule that only one staff member remembers will remain fragile even if a sophisticated platform performs the checks around it. Record escalation and absence cover as part of the process.
Ask for an end-to-end case walkthrough. Follow the request into review, change the assigned employee and complete the next action. That exercise is more useful to a back-office team than a presentation limited to the customer capture screen.
3. Veriff: best for a distinct identity check inside an existing process
Veriff is a focused candidate when the business application already has a workable approval process and mainly needs a document and biometric identity step. Its session model gives that step a reference the application can track.
The integration should connect the session to the person being checked, not merely the organisation that happens to employ them. A company account can contain several contacts, each with a different role and different authority.
This distinction matters during staff changes. A replacement contact may need verification, while the company's historic orders and service records remain attached to the same business account. Designing the records separately prevents unnecessary duplication.
Veriff makes sense when that identity component can remain a clear boundary. Use the result as evidence in the existing process, with the business application controlling the next permitted action.
The project should define how long an unfinished request stays visible and what the employee sees when it stops progressing. A labelled status, a responsible person and a next action are more useful than a silent verification reference stored deep in the database.
4. Sumsub: best when onboarding involves a broader operational programme
Sumsub offers user verification as part of a wider platform that also addresses business verification and compliance-related work. It is relevant when the custom application must connect several parts of a customer onboarding programme.
Start by mapping which records belong to people and which belong to legal entities. Checking an individual's identity is different from establishing a company's details or understanding who controls it. The software data model should reflect those differences.
A broader provider may help keep related checks together, but the contract and implementation scope must identify what is included. Do not let the application team estimate a single generic “KYC integration” while operations expects several separate investigations and approval queues.
Choose the system of record for each decision. If employees can edit a status in two places, define how conflicts are resolved and which change reaches the customer. Otherwise, a clean-looking portal can display an answer that no longer matches the review team's work.
Sumsub is a sensible shortlist option when the business already understands these wider requirements. A staged release can connect the first essential process while leaving later modules clearly out of the launch acceptance criteria.
5. Entrust Identity Verification: best for projects with formal handover requirements
Entrust Identity Verification provides document and biometric checking and is worth examining when a custom application sits within an established enterprise environment. The current product name should be used in purchasing records even where older technical material refers to Onfido.
The practical issue is continuity. A bespoke application may be supported by a different supplier a year after launch. The organisation needs documentation that explains the integration without depending on the original developer's memory.
Include the verification provider in the application's operating guide. Record where credentials are managed, how the customer journey begins, where a reviewer works and what happens when the service is unavailable. Keep secrets out of the guide itself.
Entrust belongs on the list when formal review by security, procurement and operations is part of the delivery process. Give those groups the same description of data movement and responsibilities so they are approving a coherent implementation.
The final demonstration should involve the future operators. If they cannot locate a pending request or understand its next step, the project has not completed its handover simply because the API returns a valid response.
Turn the process into acceptance criteria
Write acceptance cases in business language. “An employee can identify which request needs more evidence” is useful. “The endpoint returns success” is only a technical component of that outcome.
Cover staff absence, duplicate requests and changes to customer contact details. Decide whether an employee can cancel a request and what the customer sees afterwards. These cases often expose the missing responsibilities that are invisible in the ideal onboarding journey.
A useful dashboard shows outstanding work, the responsible role and the age of the request. It should not expose raw identity images to every employee who can view a customer account. Give people the information needed for their task, with more sensitive evidence restricted to the appropriate reviewers.
These requirements belong in the custom web and mobile application brief. They should influence interface design and become concrete scenarios during quality assurance, rather than appearing as support problems after release.
Frequently asked questions
Does verifying a director verify the entire business?
No. An individual's identity and a business's legal details are different subjects. Specify whether the application needs personal identity checks, business verification, authority to act or a combination of those requirements.
Which KYC provider should a custom software project examine first?
Didit is a useful first candidate for a configurable flow with session review. Persona is relevant when approval routes vary, while Sumsub deserves consideration when the project includes a broader set of related checks.
Should reviewers work in the custom application or the provider console?
Either arrangement can work if responsibilities are clear. Avoid duplicating a full evidence review interface without a reason. Many projects only need the business application to show the relevant status and next action.
What should happen when a customer submits incomplete evidence?
Show the specific corrective step and keep it associated with the original request. Staff should be able to distinguish a fixable capture problem from a completed negative decision without asking the customer to explain the whole journey again.