We’re also having this issue, with the Woo Discount Rule plugin. It throws the following error
[UNPROCESSABLE_ENTITY] The requested action could not be performed, semantically incorrect, or failed business validation. https://developer.paypal.com/docs/api/orders/v2/#error-CANNOT_BE_NEGATIVE
or
CANNOT_BE_NEGATIVE Must be greater than or equal to 0. If the currency supports decimals, only two decimal place precision is supported.
I’m assuming the discount value is being returned incorrectly
@flycart – might need to take a look into this issue.