Proof of monthly US social security income for retirement visa

Hello everyone

I am going to apply for the Thailand retirement visa while in the US.
I am just short of the 65 k bhat monthly income requirement using my social security income. So, I will be using the combined income approach to make the requirement. Currently, my monthly SS check gets direct deposited to my US checking account.
My question is what is the best proof of documentation to provide to prove my social security income when I submit my application package to the Thai embassy in the US?

Thanks in advance

Why not ask the Thai embassy what they want?

When I applied through the LA Consulate office I sent them  a photo copy of my SS income (I just included the monthly receipt) and whatever else for documentation and there were no issues or questions.