A couple of items:
Only once have I not been paid for something additional. I found this on the online direct deposit spreadsheet. That was for the extra $1 for the checks on the waves and koalas. I called about it. They said they didn't see any pics of those items. Can't pay me for it.
I knew that the site was supposed to have them because I have a space on my worksheet for the checks and the dollar amount to be paid. BTW, I also have a space for bonus amount, if there was one.
I said that the reason there were no pics was because the site had not erected them. I could not prove they had no request to perform the checks other than my worksheet. We were at an impasse and I decided not to pursue it for the $1.
Lesson learned!
What I now do is save in a file for the site is the page that explains the amount to be paid for the checks, the Email about shops awarded that shows the bonus amounts and any other Emails like the one that they send out for additional amounts to be paid for performing the shop at night.
Since that time, I've never been shorted and there have not been any disputes one way or the other. But, it is nice to know I have backup if needed.
PS: I cannot emphasize enough the importance of having a complete worksheet for each shop performed and a file on my computer for each shop performed.