Orders which contain a tax refund cannot checkout.

[Hates]

If an order is to a zone which requires a tax refund, then during checkout Paypal returns the error PayPal failed. Tax total is invalid. as the tax amount will be a minus amount, i.e. -£5.00.

Changing this so that the tax amount is zero if a minus amount then returns the error PayPal failed. The totals of the cart item amounts do not match order amounts..

Including tax_adjustments in the initial request line items resolves the issue for me:

Hates@c5629ff

You may have a better fix than the one I did. I just needed a quick fix for production.

[alepore]

👍 just faced this problem, and old problem... spree-contrib/spree_paypal_express#107