> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fynn.eu/llms.txt
> Use this file to discover all available pages before exploring further.

# Number Ranges

> Number Ranges

By default, number ranges are already set up. However, if you need custom number ranges, you can configure them accordingly.

A separate number range can be set up for each document type (e.g., invoice, quote, order, etc.) and documents. The following types are available:

* Customers
* Subscriptions
* Invoices
* Credit Notes
* Dunning Letters / Payment Reminders
* Payments
* Cancellations
* DATEV Debtor Numbers
* Mandate Reference (SEPA Direct Debit)

## Setting Up Number Ranges

### Placeholders

To customize your numbers individually, various placeholders are available:

* `{number}`: A sequential number that is automatically generated.
* `{day}`: The day of the month (e.g., 10).
* `{month}`: The month (e.g., 09).
* `{year}`: The year (e.g., 22).
* `{yearLong}`: The full year (e.g., 2022).
* `{customerNumber}`: The customer number.

### Number Assignment

Fynn offers two different methods for number assignment:

* <b>Sequential Number</b>: Your number is based on a sequential sequence.
* <b>Random String</b>: Your number is generated with random numbers and letters.

With these options, you can ensure that your document numbers exactly meet your requirements.

### Number Formatting

In the "Format" field, you can set the format for the numbers. For example, for invoices, you could use the format `RE-{number}`.

## Customize Number Ranges

<Steps>
  <Step title="Open the Settings">
    Go to [Settings > Number Ranges](https://app.fynn.eu/settings/number-ranges)
  </Step>

  <Step title="Configure the Number Ranges">
    <Frame>
      <img src="https://mintcdn.com/fynnsubscriptionbilling/Oz1fjsoxDmWZX8Mb/images/update-number-ranges.png?fit=max&auto=format&n=Oz1fjsoxDmWZX8Mb&q=85&s=8c347eb617beb46813a6d09bf5566e6c" alt="Number Ranges" width="1678" height="1167" data-path="images/update-number-ranges.png" />
    </Frame>
  </Step>

  <Step title="Click on Save" />
</Steps>

<Note>
  Once assigned, number ranges will not be reassigned, regardless of whether the "Current Number" is reset.
</Note>