App that allows for a later pay date?

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So my store has a such a drastic range of product size so its hard to have boxes for everything. right now they way we ship is we box up the product (more times than not we make a box to fix the dimensions) take it to usps for a quote and then we call the customer and charge them over for shipping and the product. I know its the most efficient but for us it works decent-well. So is there an app that can kinda let me continue to do this? (most of our wholesale companies do this too) or something like how gas stations charge a dollar a day of then charge the full amount the following day? 

thank you