I've set up a custom order line calculator. It works perfectly fine and everything looks fine in the purchase flow. When using e.g. invoice it works aswell and the finalized order is updated correctly.

But when going trough a payment provider, in this case Bambora (epay), the finalized orders total amount is incorrect compared to the calculator. Bombora does collect the correct calculated price, just seems like something happens when it is calculated for the finalized order. So in backoffice I get this:

And the front end user sees the wrong price as well at the end of the purchase flow.

I'm guessing it is in the finalized order process something goes wrong, but a bit uncertain how to handle it. Am I missing a step for a custom calculator to work with a payment provider?

Just in case it helps, here is the code for the custom calculator, but as mentioned this part works as expected:

    [SuppressDependency("TeaCommerce.Api.PriceCalculators.IOrderLineCalculator", "TeaCommerce.Api")]
public class MemberOrderLineCalculator : OrderLineCalculator
{

    public MemberOrderLineCalculator(IVatGroupService vatGroupService, IProductInformationExtractor productInformationExtractor)
      : base(vatGroupService, productInformationExtractor)
    {
    }

    public override Price CalculatePrice(OrderLine orderLine, Currency currency, Order order)
    {
        decimal price;
        var originalPrice = orderLine.OriginalUnitPrices.Get(currency.Id).Value;

        var helper = new Umbraco.Web.UmbracoHelper(Umbraco.Web.UmbracoContext.Current);
        var product = helper.TypedContent(orderLine.ProductIdentifier);
        var allowMemberPrice = product.GetPropertyValue<string>("memberPriceAuthorized", true).Split(',');
        var isMemberAuthorized = helper.MembershipHelper.IsMemberAuthorized(allowGroups: allowMemberPrice);

        if (product == null || !isMemberAuthorized)
            return new Price(originalPrice, orderLine.VatRate, currency);

        price = product.GetPropertyValue<decimal>("memberPriceDKR");

        if (price == 0)
            return new Price(originalPrice, orderLine.VatRate, currency);

        return new Price(price, orderLine.VatRate, currency);
    }
}

Best regards, Johnny.