> For the complete documentation index, see [llms.txt](https://docs.idlayr.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.idlayr.com/get-started/sdks/ios/mobile-web-and-app-clip.md).

# Mobile web & App clip

Secure SNA With App Clip

```mermaid
sequenceDiagram
    participant XO as Website (via mobile)
    participant SDK as AppClip with IDlayr SDK (Device)
    participant CB as Customer Backend
    participant IB as IDlayr Backend
    participant MNO as Mobile Network Operator

    XO->>CB: Initiate MFA

    rect rgb(255,255,200)
        note over CB,IB: Coverage Process
    end
    CB->>IB: GET /v1/eligibility/phone-numbers/{number}
    IB-->>CB: Carrier supported
    
    CB->>IB: POST /v1/number-verification/secure-sna-checks/
    IB-->>CB: check_id + check_url

    CB->>SDK: Initiate AppClip for SNA

    SDK->>SDK: Launch AppClip SDK for SNA

    SDK->>SDK: IDlayr's SDK Enforce cellular data channel
    CB->>SDK: Provide check_url to AppClip
    SDK->>MNO: Follow check_url and all redirects
    MNO->>SDK: Response with code or error
    SDK->>CB: Send code from redirect to Customer Backend
    CB->>IB: PATCH /v1/number-verification/secure-sna-checks/{check_id} with code
    IB->>MNO: Request Result
    MNO-->>IB: Result
    IB->>CB: Final result (PASS/FAIL)

    note over XO,CB: Control passes from AppClip back to Website

    alt ❌ SNA authentication failed
        CB-->>XO: Fallback to alternate authentication flow
    else ✅ SNA authentication complete
        CB->>XO: Authentication success    
    end


```


---

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