Super Soaker Central

I think this is in the right forum, I am new to ordering from mcmaster, please move this thread to the apropriate forum.
Anyway, I just placed my first order for LRT yesterday, and am expecting it to come today. But, for method of payment, I selected "open account" as I don't have a credit card, so does that mean I have to wait a bit until I pay them, or do they give me the LRT first, then ask for the money?
Thanks in advance.

Don't ask us this because we are not McMaster-Carr because we won't be able to answer it (I used a credit card each time). Ask McMaster-Carr this question. They have an email link from every page.