SF_10.1, SF_10.2, SF_11.0, SF_11.1, SF_11.2, SF_12.0, SF_12.1, SF_12.2, SF_13.0, SF_13.1, SF_13.2, SF_13.3, SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://docs.sitefinity.com/for-developers-query-payment-methods

GetPaymMethodByTitle.cs

using System.Linq;
using Telerik.Sitefinity.Ecommerce.Orders.Model;
using Telerik.Sitefinity.Modules.Ecommerce.Orders;

namespace Telerik.Sitefinity.Documentation.CodeSnippets.DevGuide.SitefinityEssentials.Modules.Ecommerce.PaymentMethods.PaymentProcessors
{
    public partial class PaymentProviderSnippets
    {
        public static PaymentMethod GetPaymentMethodByTitle(string title)
        {
            OrdersManager ordersManager = OrdersManager.GetManager();

            PaymentMethod paymentMethod = ordersManager.GetPaymentMethods().Where(p => p.Title == title).SingleOrDefault();

            return paymentMethod;
        }
    }
}