retrieveFromCredentialOffer

private val infoResult: CompleteableDeferred<Unit>?  = null

suspend fun retrieveCredentialFromOffer(credentialOfferIntentData: String) {
    walletSdk.attestations.retrieveFromCredentialOffer(credentialOfferIntentData).collect { event ->
        when (event) {
            is CredentialOfferEvent.InfoEvent -> {
                // this contains information about the credential offered to the app
                credentialOfferInfo = event.credentialOfferInfo
                // save this event's result, it needs to be completed to continue the flow
                infoResult = event.result
            }
            CredentialOfferEvent.InfoParsingError, // credential info not parsable
            CredentialOfferEvent.ParsingError, // credential not parsable
            CredentialOfferEvent.IssuanceError, // credential issuance fails
            CredentialOfferEvent.NotImplementedError // trying to issue a credential type no implemented yet
            -> {
               // handle the error in the app
            }
            is CredentialOfferEvent.OpenUrlForAuthEvent -> {
                // open url returned by event in browser or handle login process in the app
                val url = event.authoriztationUrl
            }
        }
    }
}

// complete the InfoEvent, continue with next (success) event -> CredentialOfferEvent.OpenUrlForAuthEvent
fun approveDownloadOfferedCredential() {
    infoResult?.complete(Unit)
    infoResult = null
}

public func fetchCredentialOffer(with _data: String) async
throws(CredentialOfferError) -> ([CredentialOfferInfo], URL?) {
    var array: [CredentialOfferInfo] = []
    for await value in WalletSdk.shared.attestations.retrieveFromCredentialOffer(credentialOfferIntentData: _data) {
        if let error = CredentialOfferError.from(event: value) {
            // handle error in the app
        }
        switch onEnum(of: value) {
        case .infoEvent(let _event):
            array = _event.credentialOfferInfo
            _event.result.complete(value: KotlinUnit()) // Trigger to process for auth-url for download
            continue
        case .openUrlForAuthEvent(let _event):
            let authURL = _event.authorizationUrl
            return (array, URL(string: authURL))
            // open url returned by event in browser or handle login process in the app
        default:
            // check if we are missing a new error code / event
            // in CredentialOfferError.from(event: value)
        }
    }
    return (array, nil)
}