let from = "testuseraaaa"
let to = "testuserbbbb"
var amount = "10.0000 SYS"
let memo = "Test transfer."

let transaction = EosioTransaction()
transaction.rpcProvider = EosioRpcProvider(endpoint: URL(string: "https://my.blockchain.domain")!)
transaction.serializationProvider = EosioAbieosSerializationProvider()

let eosioAppSignatureProvider = EosioReferenceAuthenticatorSignatureProvider.shared
eosioAppSignatureProvider.returnUrl = "myappurl://"
eosioAppSignatureProvider.declaredDomain = "myapp.domain.com"

// Optional, set security exclusions if testing or debugging
if let theSecurityExclusions = self.securityExclusions {
    eosioAppSignatureProvider.securityExclusions = theSecurityExclusions
}

transaction.signatureProvider = eosioAppSignatureProvider

let action = try! EosioTransaction.Action(
    account: EosioName("eosio.token"),
    name: EosioName("transfer"),
        authorization: [EosioTransaction.Action.Authorization(
        actor: EosioName(from),
        permission: EosioName("active"))
      	 ],
    data: Transfer(
        from: EosioName(from),
        to: EosioName(to),
        quantity: amount,
        memo: memo)
)
transaction.add(action: action)

transaction.signAndBroadcast { (result) in
    print(try! transaction.toJson(prettyPrinted: true))
    switch result {
    case .failure (let error):
        print("Error = \(error)")
        self.showAlert(title: error.errorCode.rawValue, message: "\(error.localizedDescription)", dismiss: "Sorry :(")
    case .success:
        if let transactionId = transaction.transactionId {
            print("SUCCESS!!!!!!")
            self.showAlert(title: "SUCCESS!!!!!!", message: "TransactionId: \(transactionId)", dismiss: "OK :)")
            print(transactionId)
        }
    }
}

let eosioAppSignatureProvider = EosioReferenceAuthenticatorSignatureProvider.shared
eosioAppSignatureProvider.returnUrl = "myappurl://"
eosioAppSignatureProvider.declaredDomain = "myapp.domain.com"

// Initialize security exclusions and set if desired. Optional.
if let theSecurityExclusions = self.securityExclusions {
    eosioAppSignatureProvider.securityExclusions = theSecurityExclusions
}

eosioAppSignatureProvider.getAvailableKeys() { (response) in
    if let error = response.error {
	     // Handle error
    }
    if let keys = response.keys {
        // Get Accounts for Keys and potentially let users choose which
        // account key to use.
    }
}

let eosioAppSignatureProvider = EosioReferenceAuthenticatorSignatureProvider.shared
eosioAppSignatureProvider.returnUrl = "myappurl://"
eosioAppSignatureProvider.declaredDomain = "myapp.domain.com"

// Initialize security exclusions and set if desired. Optional.
if let theSecurityExclusions = self.securityExclusions {
    eosioAppSignatureProvider.securityExclusions = theSecurityExclusions
}

var signRequest = EosioTransactionSignatureRequest()
signRequest.serializedTransaction = serializedTransaction
signRequest.publicKeys = publicKeys
signRequest.chainId = chainId

eosioAppSignatureProvider.signTransaction(request: signRequest) { (response) in
    ...
}