It's only 4 simple steps to do that.
STEP 1 - You should receive a quotation email from us and you should see a button in the email that says "View Price Quote", click on it to get to the quotation.
STEP 2 - Check the amount / price before accepting the quotation by clicking the "Accept" button on the top right.
STEP 3 - You should receive another email from us and you should see there's a button in the email that says "View Invoice", click on it to view the invoice.
STEP 4 - Check the total invoice amount again before clicking the top right "Pay Invoice" button to make payment.