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+# Wallet Integration Guide
+
+## Table of Contents
+
+* [Getting Credentials Into the Wallet](#getting-credentials-into-the-wallet)
+
+## Getting Credentials Into the Wallet
+
+### Opening a Deep Link / Universal App Link (From Outside)
+
+Deep links are useful because they allow users to interact with the wallet
+from the outside (while they're not in the wallet app itself), but instead
+are clicking on a link in a mobile web browser, opening a link pasted to them
+in a chat app, or scanning a URL QR code with the general mobile camera.
+
+**Dev note:**
+The custom protocols for deep links as well as universal app links are configured
+in `app.conf.js`: 
+
+* in the `LinkConfig.schemes` constant
+* but also in `expo.ios.associatedDomains` and `CFBundleURLSchemes`
+* also in `expo.android.intentFilters`
+
+see https://docs.expo.dev/linking/into-your-app/
+and https://docs.expo.dev/linking/overview/#universal-linking
+
+The actual link router is set up in `/app/lib/deepLink.ts > deepLinkConfigFor()`
+
+### Pasting a Deep Link (While In Wallet)
+
+Same as above; you should be able to paste a deep link into the 'Add Credential'
+screen textbox, or scan a QR code containing a deep link _while inside the
+wallet app_.
+
+**Dev note:** See `/app/screens/AddScreen/AddScreen.tsx > addCredentialsFrom()`
+for how deep links are handled.
+
+### Scanning an Interaction URL (While In Wallet)
+
+Not currently supported, see issue https://github.com/openwallet-foundation-labs/learner-credential-wallet/issues/764
+
+**Dev note:** Support for this would have to be added to
+`/app/screens/AddScreen/AddScreen.tsx > onReadQRCode()`
+
+### Pasting Raw VC or VP JSON Into Wallet Textbox
+
+On the 'Add Credential' screen, you can paste the full JSON representation
+of a VC that you've copied into your clipboard (such as from a website with VC
+examples).
+
+**Dev note:** See `/app/screens/AddScreen/AddScreen.tsx > addCredentialsFrom()`
+for how deep links are handled.
+
+### Scanning Raw VC/VP JSON QR Code (While In Wallet)
+
+(Same as previous item)
+While inside the wallet, you can use the 'Scan QR Code' button on the 'Add
+Credential' screen to read a QR code that contains (as text) the raw JSON
+of a VC or a VP.
+
+**Dev note:** See `/app/screens/AddScreen/AddScreen.tsx > onReadQRCode()`
+which calls `/app/lib/decode.ts > credentialsFrom`
+
+### Pasting a URL to a Statically Hosted VC/VP
+
+If a VC or VP is hosted on some website (like github pages or Google Drive),
+you can just copy and paste the URL to it into the textbox on the 'Add Credential'
+screen.
+
+**Dev note:** See `/app/screens/AddScreen/AddScreen.tsx > addCredentialsFrom()`
+which calls `/app/lib/decode.ts > credentialsFrom`
+
+TODO: Add the ability to fetch URLs through a CORS proxy.
+
+### Scanning a URL to a Statically Hosted VC/VP (While In Wallet)
+
+Same as above, but instead of copying and pasting, you can use the 'Scan QR Code'
+button from inside the wallet, and it will fetch and store the VC on the other
+end. (Same deal, re CORS proxy)
+
+**Dev note:** See `/app/screens/AddScreen/AddScreen.tsx > onReadQRCode()`
+which calls `/app/lib/decode.ts > credentialsFrom`
+
+TODO: This does mean that scanning a deep link (while inside the wallet)
+is not currently supported.
+
+### Upload VC from File
+
+You can also add a VC you have stored as a file by going to 'Add Credential'
+screen and clicking on 'Add from file' button.
+Note that this includes both files stored locally on the device, but also
+many mobile OSs also add other file storage services (like Google Drive, Dropbox,
+etc) to this screen.
+
+**Dev note:** See `/app/screens/AddScreen/AddScreen.tsx > addFromFile()`
+for more details.
+
+### Restore VCs from Backup
+
+If you have a previous wallet backup (from the Settings > Backup Wallet screen),
+if you go to Settings > Restore wallet, any VCs from that backup (that don't
+already exist in your wallet) are also added.
+
+### Receive a Share Intent from Another App
+
+NOTE: We used to support this in previous LCW versions, but it was disabled
+due to extra complexity, and no apps were sharing VCs at the time.
+
+for iOS, see:
+* ShareKit and App Extensions https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/index.html
+* App Intents https://developer.apple.com/documentation/appintents/
+
+for Android, see:
+* Sharesheet docs https://developer.android.com/training/sharing/send
+
+## Example Requests
+
+### Request a VC
+
+```
+https://lcw.app/request?request=%7B%22credentialRequestOrigin%22:%22https://interop-alliance.github.io/wallet-to-webapp-demo%22,%22protocols%22:%7B%22vcapi%22:%22https://verifierplus.org/api/exchanges/42cb7245-a732-409f-8182-1db416a793f7%22%7D%7D
+```
+
+```json
+{
+  "credentialRequestOrigin": "https://interop-alliance.github.io/wallet-to-webapp-demo",
+  "protocols": {
+    "vcapi": "https://verifierplus.org/api/exchanges/42cb7245-a732-409f-8182-1db416a793f7"
+  }
+}
+```
+
+leads to: Exchange Credentials Request popup.
+"An organization would like to exchange credentials with you."
+
+Select credentials, wallet POSTS a VP to the interact endpoint.
+
+## Testing
+
+### 1) Test Legacy Credential Request flow (DCC Admin Dashboard Issuing)
+
+Make sure the [Legacy Credential Request flow](https://github.com/digitalcredentials/docs/blob/main/request/credential_request.md),
+that is, picking up credentials via the DCC issuer's Admin Dashboard is working.
+
+https://badging.dcconsortium.org/lcw-experience-badge
+
+Example legacy deep link:
+
+```
+https://lcw.app/request.html?issuer=issuer.example.com&auth_type=bearer&challenge=7f4a278e...&vc_request_url=https://issuer.dcconsortium.org/exchange/7bad4b...
+```
+
+Test in both modes (they result in slightly different code paths in the app):
+
+* "cold start" - LCW is closed (not running in the background), and you click on
+  the 'Add to LCW' button on the pickup page or scan the QR code.
+* "warm start" - same as above, but LCW is running in the background
+
+### 2) Test Legacy Credential Request Link by pasting it into 'Add Credential' Textbox
+
+Similar to the previous item, but you're going to paste the legacy deep link
+directly into the 'Add Credential' screen's text box.
+To get the link - go to the LCW Experience Badge pickup page (from your email),
+click on the 'Add to LCW' button, and then copy the redirected request,
+looks like this:
+
+```
+dccrequest://request?issuer=issuer.example.com&auth_type=bearer&challenge=7f4a278e...&vc_request_url=https://issuer.dcconsortium.org/exchange/7bad4bee...
+```
+Open the app manually, and paste that URL into the 'Add Credential' screen textbox.
+