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+## OpenId4VP support for IETF SD-JWT credential formats (vc+sd-jwt and dc+sd-jwt)
+
+This document provides a comprehensive overview of the process for presenting sd-jwt credential to Verifier(relying party), adhering to the OpenId4VP specification.
+
+### Actors involved
+1. User
+2. Inji Wallet
+3. inji-openid4vp_ (Library for processing OVP request)
+4. Verifier (Relying Party)
+
+###  Sequence diagram - Present sd-jwt credential to Verifier (Relying Party)
+
+```mermaid
+sequenceDiagram
+  autonumber
+  participant User as 🙋 User
+  participant Wallet as  📱 Inji Wallet
+  participant OVP_Lib as 🔐📄 Inji OpenId4VP (Library)
+  participant RP as 🌐 Verifier (Relying Party)
+
+  Note over RP: Prepare Authorization Request
+  RP-->>Wallet: Share Authorization Request as QR Code
+  User->>Wallet: Scan QR Code
+  Wallet->>OVP_Lib: Forward authorization request
+  Note over OVP_Lib: Validate authorization request
+  OVP_Lib-->>Wallet: Return validated authorization request
+  Note over Wallet: Process Authorization Request and Filter matching credentials based on requested claims
+  Wallet-->>User: Display matching credentials to user for selection
+  User->>Wallet: User selects credential(s)
+  Wallet->>OVP_Lib: Pass user's selected credentials after face verification if needed
+  Note over OVP_Lib: Validate and prepare for VP creation
+  OVP_Lib->>OVP_Lib: Check if Holder key binding possible<br/>`cnf` attribute in VC
+  alt Holder key binding available(`cnf` exists)
+    OVP_Lib->>OVP_Lib: Prepare key binding details for signing
+    OVP_Lib-->>Wallet: Return header and payload to create signature for Key binding
+    Wallet->>Wallet: Create signature for Key binding
+    Wallet->>OVP_Lib: Share signature for Key binding
+    OVP_Lib->>OVP_Lib: Attach signature to VP Token
+    OVP_Lib->>RP: Submit VP Token with key binding
+  else Holder key binding not available(`cnf` is missing)
+    OVP_Lib->>OVP_Lib: Prepare VP Token<br/>(No key binding required)
+    OVP_Lib-->>Wallet: Indicate no key binding required
+    Wallet->>OVP_Lib: Return the data without signature
+    OVP_Lib->>RP: Submit VP Token without key binding
+  end
+
+```
+
+#### Steps involved
+##### 1. Share Authorization Request as QR Code
+The Verifier prepares an authorization request and shares it with the Wallet in the form of a QR code by value or by reference.
+
+##### 2. Scan QR Code
+User scans the QR code using the Wallet application to retrieve the authorization request.
+
+##### 3. Forward authorization request
+The Wallet forwards the scanned authorization request to the _inji-openid4vp_ library for processing and validation.
+
+````
+OpenId4VP.authenticateVerifier(
+    urlEncodedAuthorizationRequest, 
+    trustedVerifiers, 
+    shouldValidateClient
+)
+
+Note:
+- urlEncodedAuthorizationRequest is base64 url encoded authorization request received from Verifier.
+- trustedVerifiers is list of trusted Verifier known to wallet.
+- shouldValidateClient is boolean to indicate whether to validate client or not if client-id-scheme is pre-registered. 
+
+````
+
+##### 4. Return validated authorization request
+The _inji-openid4vp_ library validates the authorization request and returns the validated request to the Wallet.
+
+##### 5. Display matching credentials to user for selection
+The Wallet processes the authorization request and filters the credentials that match the requested claims. 
+It then displays these matching credentials to the user for selection.
+
+##### 6. User selects credential(s)
+The user selects one or more credentials from the displayed list in the Wallet application.
+
+##### 7. Pass user's selected credentials after face verification if needed
+If any of the selected VCs has face/picture, the wallet asks user to perform face verification before passing the selected credentials to the _inji-openid4vp_ library.
+
+````
+OpenId4VP.constructUnsignedVPToken(
+    selectedVCs, 
+    holderId, 
+    signatureAlgorithm
+)
+
+Note:
+- selectedVCs is list of user selected VCs to be presented to Verifier. It is a map of credential format and credential data w.r.t input descriptor
+- holderId is unique identifier for the holder. It can be DID or public key thumbprint.
+- signatureSuite is signature algorithm to be used for signing VP Token. This is needed for ldp_vc format only. It's JsonWebSignature2020 as we are supporting only Ed25519Signature2020
+  - For the SD-JWT format,, this field is ignored because the signature algorithm is determined from the `cnf` claim
+
+````
+
+##### 8. Check if Holder key binding possible and prepare VP token
+The _inji-openid4vp_ library validates the selected credentials and check if key binding possible or not.
+If `cnf` claim exists, it is considered that key binding is possible, otherwise not possible.
+
+
+##### 9. Prepare key binding details for signing
+The _inji-openid4vp_ library creates the unsigned VP Token data and prepares the key binding details for signing.
+
+##### 10. Return header and payload to create signature for Key binding
+The _inji-openid4vp_ library returns header and payload as unsignedVPToken to create signature.
+
+````
+It returns a map of credential format and unsigned VP Token data to the Wallet to create signature
+
+for vc+sd-jwt and dc+sd-jwt format 
+{
+    "vc+sd-jwt": {
+        "uuid": "<header>.<payload>" 
+    },
+    "dc+sd-jwt": {
+       "uuid": "<header>.<payload>"
+    }
+}
+
+Note:
+- It returns header and payload to create signature for Key binding.
+  - uuid is being used to map the signature returned from wallet to the respective sd-jwt vc
+````
+
+##### 11. Create signature for Key binding
+The Wallet creates a signature for key binding using the provided header and payload for each sd-jwt format credential.
+It extracts `alg` from the provided header and use that algorithm to create signature.
+
+
+##### 12. Share signature for Key binding
+The wallet shares key binding signature with the _inji-openid4vp_ library.
+
+##### 13. Attach signature to VP Token
+The _inji-openid4vp_ library attaches the signature to already created unsigned vp token.
+
+##### 14. Submit VP Token with key binding
+The _inji-openid4vp_ library submits the VP Token with key binding to the Verifier(relying party) as per Authorization request response mode.
+
+##### 15. Prepare VP Token without key binding
+The _inji-openid4vp_ library create vp token without key binding details.
+
+##### 16. Indicate no key binding required
+The _inji-openid4vp_ library creates the unsigned VP Token data without key binding details.
+
+````
+It returns a empty map of credential format because key binding is not required.
+
+for vc+sd-jwt and dc+sd-jwt format 
+{
+    "vc+sd-jwt": {},
+    "dc+sd-jwt": {}
+}
+
+````
+
+##### 17. Return the data without signature
+The wallet does not create the signature and return the data as is.
+
+##### 18. Submit VP Token without key binding
+The _inji-openid4vp_ library submits the VP Token without key binding to the Verifier(relying party) as per Authorization request response mode.
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