Got my first speeding ticket in the states today on the I5....13 mph over the 60mph limit

anyways its my fault and going to send in a US money order to them tomorrow. Just curious what happens next and will I have any problems at the border crossing going forward?...When I mail them the money, will they mail be back a receipt or any way to prove that I paid the ticket?...I want hard copy receipt so in the future if this comes up at the border I can prove/show the agent.
Cheers