Hi staceython, Wow what an interesting situation. But if you would allow me to give you my opinion, and I totally disagree with the members who say "you should not get paid" and I will tell you why they are 100% wrong.
We all know that assignment shops comes with requirements, examples of such requirements are A) you need to go to the right establishment at the right day and time.

you should buy a specific item, not to exceed the amount of reimbursement. C) you need to take certain photos, or visit the restroom and you see where I am going.
Question: any of these requirements state that for your shop to be accepted and paid for YOU MUST PAY FOR WHAT YOU GET? I don't thinks so, or I have never seen such requirement.
So, you did the report according to the assignment requirements, you stated that you held your end of the contract between you and the MSP. You delivered the report on time and you said that it was accepted.
So for all you members who say wrongly that staceython should not get paid, WHY? Where is the requirement that staceython must personally pay for her meal? It does not exist, and the MSP cannot change the rules once the contact was accepted by both parties.
What if staceython found $75.00 on the street, and used that to pay for the meal? Should the MSP pay her for the report, AND any reimbursement?!
staceython I suggest you reach out to the MPS and explain that you were honest enough to tell them the circumstances, and if you had any prior dealings with the MSP and they value you as a good shopper, they should live up to their end f the bargen. If not LEGALLY.
You should be paid, you did the work, and your good fortune is irrelevant to your contact with the MSP.
My policy is that I stop working with any MSP that does not pay me. I am trying to do business, I am a business so is the MSP. Do you think the MPS will allow any of their clients not to pay them if all entries of the contract were adhered to? NO WAY! So why does the MSP do it to the shopper?
The topic of reimbursement came up during the shoppersFest 2017 in Orlando, FL. I now understand better how this is all done.
You did the report, you should be paid, your good fortune is irrelevant.