namespace Mollie.Api.Models
{
    /// <summary>
    /// Payment method
    /// </summary>
    public enum Method
    {
        ideal,
        creditcard,
        mistercash,
        sofort,
        banktransfer,
        directdebit,
        belfius,
        kbc,
        bitcoin,
        paypal,
        paysafecard,
    }
}
namespace Mollie.Api.Models
{
    /// <summary>
    /// Payment method
    /// </summary>
    public enum Method
    {
        ideal,
        creditcard,
        mistercash,
        sofort,
        banktransfer,
        directdebit,
        belfius,
        kbc,
        bitcoin,
        paypal,
        paysafecard,
        giftcard,
    }
}

Add giftcard method to list of methods
Add giftcard method to list of methods

Mollie will be launching support for gift cards soon.