Once the ePayment Invoice has been sent, it is not possible to send another ePay for the same order.
It is not necessary to resend an ePayment Invoice if you have changed the amount of the Order. In fact it is not possible to resend an ePayment for the same order.
The links to View Invoice and Send Payment that are sent with the email or SMS, link to the Clover Order. So when the customer clicks on either link, they will be taken to the edited Order. You can resend the original ePayment Invoice. It will contain the original amount, but when your customer clicks on the View Invoice or Send Payment, the will see the new amount you requested.