For project work or large parts orders we will send you a proposal via email. To place an order based on the proposal just follow the instructions in the email to e-sign the proposal. If a pre-payment is specified in the Terms box of the proposal, then you can either mail a check for the required amount or place an online payment on our Payment page, https://ait.cx/payment.  If you have any questions regarding the proposal or need to make changes, please contact the person directly who sent it to you.