...
global::Xamarin.Forms.Forms.Init ();
var config = new PayPalConfiguration(PayPalEnvironment.NoNetwork,"Your PayPal ID from https://developer.paypal.com/developer/applications/")
{
	//If you want to accept credit cards
	AcceptCreditCards = true,
	//Your business name
	MerchantName = "Test Store",
	//Your privacy policy Url
	MerchantPrivacyPolicyUri = "https://www.example.com/privacy",
	//Your user agreement Url
	MerchantUserAgreementUri = "https://www.example.com/legal",
	// OPTIONAL - ShippingAddressOption (Both, None, PayPal, Provided)
	ShippingAddressOption = ShippingAddressOption.Both,
	// OPTIONAL - Language: Default languege for PayPal Plug-In
	Language = "es",
	// OPTIONAL - PhoneCountryCode: Default phone country code for PayPal Plug-In
	PhoneCountryCode = "52",
};

//iOS
CrossPayPalManager.Init(config);

//Android
CrossPayPalManager.Init(config, this);
...

<key>NSCameraUsageDescription</key>
<string>We will use your camera to scan the credit card</string>

protected override void OnActivityResult (int requestCode, Result resultCode, Intent data)
{
	base.OnActivityResult (requestCode, resultCode, data);
	PayPalManagerImplementation.Manager.OnActivityResult(requestCode, resultCode, data);
}

protected override void OnDestroy()
{
	base.OnDestroy();
	PayPalManagerImplementation.Manager.Destroy();
}

var result = await CrossPayPalManager.Current.Buy (new PayPalItem ("Test Product", new Decimal (12.50), "USD"), new Decimal (0));
if (result.Status == PayPalStatus.Cancelled)
{
	Debug.WriteLine ("Cancelled");
}
else if(result.Status == PayPalStatus.Error)
{
	Debug.WriteLine (result.ErrorMessage);
}
else if(result.Status == PayPalStatus.Successful)
{
	Debug.WriteLine (result.ServerResponse.Response.Id);
}

var result = await CrossPayPalManager.Current.Buy (new PayPalItem[] {
				new PayPalItem ("sample item #1", 2, new Decimal (87.50), "USD",
					"sku-12345678"), 
				new PayPalItem ("free sample item #2", 1, new Decimal (0.00),
					"USD", "sku-zero-price"),
				new PayPalItem ("sample item #3 with a longer name", 6, new Decimal (37.99),
					"USD", "sku-33333") 
			}, new Decimal (20.5), new Decimal (13.20));
if (result.Status == PayPalStatus.Cancelled)
{
	Debug.WriteLine ("Cancelled");
}
else if(result.Status == PayPalStatus.Error)
{
	Debug.WriteLine (result.ErrorMessage);
}
else if(result.Status == PayPalStatus.Successful)
{
	Debug.WriteLine (result.ServerResponse.Response.Id);
}

//Optional shipping address parameter into Buy methods.
var result = await CrossPayPalManager.Current.Buy(
			new PayPalItem(
				"Test Product",
				new Decimal(12.50), "USD"),
				new Decimal(0),
				new ShippingAddress("My Custom Recipient Name", "Custom Line 1", "", "My City", "My State", "12345", "MX")
		   );
if (result.Status == PayPalStatus.Cancelled)
{
	Debug.WriteLine("Cancelled");
}
else if (result.Status == PayPalStatus.Error)
{
	Debug.WriteLine(result.ErrorMessage);
}
else if (result.Status == PayPalStatus.Successful)
{
	Debug.WriteLine(result.ServerResponse.Response.Id);
}

var result = await CrossPayPalManager.Current.RequestFuturePayments();
if (result.Status == PayPalStatus.Cancelled)
{
	Debug.WriteLine ("Cancelled");
}
else if(result.Status == PayPalStatus.Error)
{
	Debug.WriteLine (result.ErrorMessage);
}
else if(result.Status == PayPalStatus.Successful)
{
	//Print Authorization Code
	Debug.WriteLine(result.ServerResponse.Response.Code);
}

var result = await CrossPayPalManager.Current.AuthorizeProfileSharing();
if (result.Status == PayPalStatus.Cancelled)
{
	Debug.WriteLine ("Cancelled");
}
else if(result.Status == PayPalStatus.Error)
{
	Debug.WriteLine (result.ErrorMessage);
}
else if(result.Status == PayPalStatus.Successful)
{
	Debug.WriteLine (result.ServerResponse.Response.Code);
}

//Print Client Metadata Id
Debug.WriteLine(CrossPayPalManager.Current.ClientMetadataId);

//Optional parameter CardIOLogo("PayPal", "CardIO" or "None") for ScanCard method by default "PayPal" is used
var result = await CrossPayPalManager.Current.ScanCard();
if (result.Status == PayPalStatus.Cancelled)
{
	Debug.WriteLine("Cancelled");
}
else if (result.Status == PayPalStatus.Successful)
{
	if (result.Card.CardImage != null)
	{
		CardImage.Source = result.Card.CardImage;
	}
	Debug.WriteLine($"CardNumber: {result.Card.CardNumber}, CardType: {result.Card.CardType.ToString()}, Cvv: {result.Card.Cvv}, ExpiryMonth: {result.Card.ExpiryMonth}");
	Debug.WriteLine($"ExpiryYear: {result.Card.ExpiryYear}, PostalCode: {result.Card.PostalCode}, RedactedCardNumber: {result.Card.RedactedCardNumber}, Scaned: {result.Card.Scaned}");
}