Series

A series is a placeholder for a counter with number formatting details to be able to generate a code.

Overview

Series allow users to configure numbering templates for any document that requires unique sequential identifiers (such as invoices). Each series defines how numbers are formatted, including prefixes, suffixes, and zero-padding rules. For example, given a series configured with the options on the left, will produce a identifiers as in the right box:

Prefix	ES-
Padding	5
Start number	1
Code	INV

INV-ES-00001
INV-ES-00002
INV-ES-00003
INV-ES-00001
INV-ES-00002
INV-ES-00003

Create a new series

Field	Description	API Property
Name	Human-readable label identifying the series.	name
Code (Optional)	Internal or business code used to categorize series.	code
Prefix (Optional)	Text placed before the numeric portion of the generated code.	prefix
Padding	Total number of digits in the numeric sequence. Zeros are added to the left when necessary.	padding
Start Number	The first number to be issued in the sequence.	last_index
Suffix (Optional)	Text appended after the numeric part.	suffix
Description (Optional)	Free text for internal documentation or identification.	description

Preview panel

On the right side of the form, the UI displays a live preview of the resulting code based on the current field values. For example:

INV-ES-00001

Here you can verify the final output format before saving.

Using your series

You will be able to use the series you’ve created from the API or through the “Add sequential code” step in your workflow. This will ensure your invoice numbers remain numbered correctly, as many regimes require not only unique invoice identifiers but also sequential numbering.

Tips

• Use prefixes for country or business unit codes (e.g., ES-, FR-, US-).
• Adjust padding to maintain consistent visual width across codes, and make sure you choose a length adequate for your invoicing volume.
• Start Number will usually be 1, unless you are continuing a series.
• Code and Description fields are for human readability and internal organization.

Related resources

API Reference	Sequences - Introduction Series - Overview Series - Fetch all series Series - Create a series Series - Fetch a series Entries - Overview Entries - Fetch all series entries Entries - Create a series entry Entries - Fetch a series entry
Related Guides	Series Guide