I don’t portray myself as an online security expert, so can not say definitively it is or not. If the stripe client keys and secret keys are private and not exposed by the call on client device, I’d say there is no concern. As far as I know it’s not possible to trick the response from Stripe so as to make the API response be different than it should in terms of showing false confirmation of payment.
But if secret key and client key are not protected, it is a security issue.