I'm having problems with the Stripe payment provider. I can create an order when the country has the default payment provider of 'Invoice'. When I change it to Stripe, via the default for a country, I get the following exception (when I clear my cookies to force a new order creation).

[NullReferenceException: Object reference not set to an instance of an object.]
Vendr.PaymentProviders.Stripe.StripeCheckoutPaymentProvider.CanProcessOrder(OrderReadOnly order, StripeCheckoutSettings settings, String& errorMessage) +177
Vendr.Core.Web.PaymentProviders.PaymentProviderBase`1.CanProcessOrder(OrderReadOnly order, IReadOnlyDictionary`2 settings, String& errorMessage) +147
Vendr.Core.Web.Events.Validation.Handlers.Order.ValidatePaymentMethodPaymentProviderCanProcessOrder.Validate(ValidateOrderPaymentMethodChange evt) +671
Vendr.Core.Events.Validation.ValidationEventHandlerBase`1.Handle(IEvent evt) +90
Vendr.Core.Events.InProcEventDispatcher.Dispatch(IEnumerable`1 handlers, T evt) +106
Vendr.Core.Events.EventBus.Dispatch(T evt) +252
Vendr.Core.Models.AggregateBase`3.Validate(IValidationEvent validationEvent) +58
Vendr.Core.Models.Order.SetPaymentMethod(Nullable`1 paymentMethodId) +528
Vendr.Core.Models.<>c__DisplayClass10_0.<Create>b__0(Order x) +270
Vendr.Core.Models.AggregateBase`3.QuietSet(Action`1 actions) +164
Vendr.Core.Models.Order.Create(IUnitOfWork uow, OrderState state, String languageIsoCode, Guid currencyId, Guid taxClassId, Guid orderStatusId, Nullable`1 paymentMethodId, Nullable`1 paymentCountryId, Nullable`1 paymentRegionId, Nullable`1 shippingMethodId, Nullable`1 shippingCountryId, Nullable`1 shippingRegionId, String customerReference) +493
Vendr.Core.Models.Order.Create(IUnitOfWork uow, Guid storeId, String languageIsoCode, Guid currencyId, Guid taxClassId, Guid orderStatusId, Nullable`1 paymentMethodId, Nullable`1 paymentCountryId, Nullable`1 paymentRegionId, Nullable`1 shippingMethodId, Nullable`1 shippingCountryId, Nullable`1 shippingRegionId, String customerReference) +392
Vendr.Core.Session.SessionManager.GetOrCreateCurrentOrder(Guid storeId, String customerReference, Boolean checkAndMove) +9093
Vendr.Core.Session.SessionManager.GetOrCreateCurrentOrder(Guid storeId) +133
Vendr.Core.Api.CoreVendrApi.GetOrCreateCurrentOrder(Guid storeId) +82

I've looked in Github, without any success. My guess would be that the order supplied as an argument is null, but the question then is why?.

I've deleted the payment provider and recreated it. I believe the important setting fields are populated. Can you please advise how I should continue with my investigations? Do I need to start debugging the payment provider itself?