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So we updated to the latest version of Express Checkout, then afterwards a lot of customers started to get 10426 errors. It seems to be somehow related.
Currently running Version 1.6.6 WooCommerce PayPal Checkout Gateway
Not sure why this is happening, the prices are all set as 2 digits.
I just double checked, it ONLY happens when using a coupon code. If I remove the coupon code, the sandbox checkout works fine. So it seems like some bad interaction with coupons now.