# Integration Guide

This section provides integration scenarios and best practices for implementing Lean Disposable in your application.

## Enrollment scenarios

Choose the enrollment flow based on your use case:

- [Enroll with OTP by SMS](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-enroll-disposable-otp-sms) — standard flow, OTP sent via SMS
- [Enroll with OTP by email](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-enroll-disposable-otp-email) — OTP sent via email *(LRA authorization required)*
- [Enroll without OTP](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-enroll-disposable-without-otp) — no OTP required *(LRA authorization required)*
- [Enroll with external OTP](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-enroll-disposable-external-otp) — OTP managed externally, e.g. PSD2 banking flow *(LRA authorization required)*
- [Enroll with eID assertion](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-enroll-disposable-eid-assertion) — enrollment via SPID, CIE, EUDIW, or other authorized eID
- [Enroll with AML identification](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-enroll-disposable-aml-identification) — enrollment via AML identification process *(LRA authorization required)*


## Reference

- [Workflow overview](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-workflow) — full enrollment workflow with steps and required methods
- [eID identification](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-eid-identification) — supported eID types and field mapping
- [How to handle errors](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-ig-how-to-handle-errors) — common errors and solutions
- [Certificate serial number](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-faq-serial-number) — how the serial number is composed
- [Allowed characters](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-faq-allowed-characters) — characters not allowed in holder fields
- [Non-unique phone number (Error 10068)](/products/leandisposable/enterprise-documentation/developer-documentation/integration-guide/lean-faq-not-unique-phone-number) — how the uniqueness check works


For the full API reference, see the [API References](/products/leandisposable/enterprise-documentation/developer-documentation/api-references) section.