Reference generator – reference numbers for bills

With OP’s reference calculator, you can easily create reference numbers for your bills.

What is a reference number?

A reference number is a series of numbers, which makes it easy to connect a received payment with the right bill. It is good practice to use reference numbers since it makes it easier for the bill’s recipient to process the bill. Bills without reference numbers may also cause extra charges.

How does OP’s reference generator work?

OP’s reference calculator creates reference numbers easily and quickly for your company’s bills. 

  1. Enter the desired basic component of the reference (at least 3 digits) to the reference calculator. The basic component can be a customer number or an order number, for example. 
  2. Click Generate reference numbers. You'll get a list of reference numbers that you can use.
  3. Copy the reference numbers or create more strings of reference numbers.

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Reference number generator

With the reference number generator, you can calculate a check digit for the reference number or series you entered. The check digit will be calculated as the last digit after the basic component of the reference. The reference number has a minimum of 4 characters with the last one being a check digit. All fields are required.
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