Problem with a negative mod value for variation

Hi,

I just started testing Stripe Payment plugin. It looks great, but I got a problem.

I set a variation and set a negative value for the modification value of the variation. (i.e. discount)
When I placed a test order, I got the error message on the checkout result.

(Translation fo Japanese)=====
The system could not proceed the payment. Paid amount was not correct. #### is required, but paid amount was ###
==============================

However, I saw the transaction log on the Stripe web as successfully paid.
When I put the positive value for the modification, it works well.

Here is the log on the plugin
==================
[01/10/2021 11:42:54 PM] – Processing variations.
[01/10/2021 11:42:54 PM] – FAILURE: Paid amount was not correct. #### is required, but paid amount was ###
[01/10/2021 11:42:54 PM] – Error email sent to [email protected], from email address used: [email protected]
[01/10/2021 11:42:54 PM] – Redirecting to results page “https://example.com/wp/stripe-checkout-result/”
==================

Thanks for your help.

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