See the latest version of the policy here:
https://docs.google.com/document/d/1o_NC1rDinDdimQ1fvw_W8jkVe6wb9vS6QlR8BvnmHwg/edit#

In order to guarantee that Medicare for All Everywhere will reimburse an expense you must get that expense pre-approved by the Budgeting Committee.

You must submit the receipt within 30 days of the expenditure
Most reasonable expenses under $100 will be approved automatically if the funds are available
The Budgeting Committee is expected to make a good faith effort to review all submitted expenses and give an approval or rejection in a timely manner. Rejections must be accompanied by a reason.