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Editorial Team
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Asked: 2026-06-10T06:56:27+00:00

I’m using PayPal. I’m sending values to PayPal, and then getting values back. I’m

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I’m using PayPal. I’m sending values to PayPal, and then getting values back. I’m not able to pass parameters because PayPal knows nothing about them. How can I get the cart values in my method without passing the parameters?

I’m able to get the values like this 

public ViewResult Index(Cart cart, string returnUrl)
{
    return View(new CartIndexViewModel
                    {
                        Cart = cart,
                        ReturnUrl = returnUrl
                    });
}

but, what if I’m not able to pass the (Cart cart) as a parameter – how do I get the values?

 public ViewResult Index()
    {

//what do i need to do here???

        return View(new CartIndexViewModel
                        {
                            Cart = cart,
                            ReturnUrl = returnUrl
                        });
    }

thanks for any help or advice.

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1 Answer

  1. Editorial Team

    I suppose you could drop cookies that store the Cart data for that session. Then after you get a post back from paypal or whatever you could read the cookies from the user’s request.

    However I would think you could save the pending transaction to the database, send whatever data it is you send to paypal, and use a key or whatever method they have to link the paypal transaction to the pending transaction in the database. This would be more secure.

    I’m sure paypal has a simple and well documented transaction process, that I would look into before trying either of these.

    If your actually trying to integrate with paypal and not just using that as an example, here is a tutorial for Paypal and MVC3.

    From PayPal:

    Relationship Between Express Checkout and Shopping Carts

    If you do not
    have your own shopping cart and have not integrated Express Checkout
    with your website, you might consider using a third-party shopping
    cart. A shopping cart is software that lets buyers put items in a
    basket and calculates totals during checkout.

    PayPal partners with a wide variety of shopping carts, all of which
    are PayPal compatible and provide secure purchases for your buyers.
    The shopping cart vendor provides instructions for integrating their
    shopping cart on your website. See the PayPal Partner Directory
    (https://www.paypal-marketing.com/emarketing/partner/directory/directory.page?type=Shopping+Cart#mode=dir&dir%5Bops%5D=either&dir%5Bkey%5D=Keyword+term&dir%5Btyp%5D%5B%5D=1&dir%5Bind%5D%5B%5D=0&dir%5Brod%5D%5B%5D=1&dir%5Brod%5D%5B%5D=2)
    for available shopping carts.

    IMPORTANT:If you choose a shopping cart, do not contact PayPal. PayPal
    has no authority over a shopping cart vendor and cannot help you
    resolve issues that might arise from the integration with or use of a
    third-party shopping cart.

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