France · Chorus Pro Guide

Introduction

In this guide, you’ll learn how to issue invoices to French public institutions using Chorus Pro.

You’ll:

Learn about Chorus Pro and its format requirements
Set up Invopop workflows:
- Supplier registration workflow
- Invoice submission workflow
Prepare the Chorus Pro platform and create credentials
Register a supplier with Chorus Pro
Send your first invoice to a French public institution

What is Chorus Pro?

Chorus Pro is a mandatory service provided by the French government for invoicing French public institutions. The platform allows businesses to upload invoices in multiple e-invoicing formats and track them throughout the French public administration process. All invoices to French public sector entities must be submitted through Chorus Pro.

The platform supports various e-invoicing formats including Cross Industry Invoice (CII), and implements the European Norm 16931 (EN16931) European standard for electronic invoicing with additional French-specific requirements.

Understanding Chorus Pro Format Requirements

Chorus Pro accepts invoices in CII format based on the EN16931 European standard. However, it adds specific French extensions and validation requirements:

EN16931 Standard The EN16931 defines the semantic data model for electronic invoices. The standard ensures interoperability across European Union (EU) member states while allowing for country-specific extensions.

Chorus Pro Extensions Chorus Pro extends the base EN16931 standard with additional French requirements:

SIRET number validation for French entities
Specific invoice types for different purposes
Service codes for government departments

In GOBL, these formats are handled via addons that you must add to each invoice. You’ll see examples of this further below.

Setup

Configure your Invopop Workspace for Chorus Pro invoicing.

Complete these steps:

Connect the required apps

Go to Configuration > Apps in the Console.
Find UN/CEFACT CII in the app list and click Connect to activate the app.
Find Chorus Pro in the app list and click Connect to activate the app.

After connecting, you’ll see both UN/CEFACT CII and Chorus Pro listed in the Enabled Apps section.

Configure the supplier registration workflow

Add a new workflow to your workspace for registering suppliers. You can start with the template below.

Chorus Pro supplier registration workflow

This workflow will issue a registration request for a supplier to complete.

Chorus Pro supplier registration workflow

This workflow will issue a registration request for a supplier to complete.

Copy and paste this code into a new Empty Party workflow code view.

{
    "name": "Register Chorus Pro Supplier",
    "description": "Enables suppliers to register for Chorus Pro invoice generation",
    "steps": [
        {
            "id": "49be5910-5588-11f0-8130-117b5da5a2d7",
            "name": "Register a supplier for Chorus Pro",
            "provider": "chorus-pro.register"
        },
        {
            "id": "45257000-5588-11f0-8130-117b5da5a2d7",
            "name": "Set State",
            "provider": "silo.state",
            "summary": "Set state to `processing`{.state .processing}",
            "config": {
                "state": "processing"
            }
        },
        {
            "id": "84f16e70-5b58-11f0-85c7-77ca7305cb3c",
            "name": "Wait for Chorus Pro credentials",
            "provider": "chorus-pro.wait"
        },
        {
            "id": "4d13c5a0-5588-11f0-8130-117b5da5a2d7",
            "name": "Set State",
            "provider": "silo.state",
            "summary": "Set state to `registered`{.state .registered}",
            "config": {
                "state": "registered"
            }
        }
    ],
    "rescue": [
        {
            "id": "a6c4f090-4ced-11f0-bcdc-61b84b5eeae8",
            "name": "Set State",
            "provider": "silo.state",
            "summary": "Set state to `error`{.state .error}",
            "config": {
                "state": "error"
            }
        }
    ]
}

Before starting, review the workflows guide to understand the general setup process.

In Console, create a new workflow and choose Empty Party workflow as the base. Name the workflow with a descriptive label such as “Chorus Pro Supplier Registration”.

The new workflow performs a single step:

Register a supplier for Chorus Pro

Add any additional steps you need such as error handling, and save the new workflow.

Keep the workflow ID at hand as you’ll need it later.

Configure invoice workflow

Add a new workflow to your workspace for issuing invoices. You can start with the template below.

Chorus Pro invoice workflow

This workflow will issue an invoice through Chorus Pro.

Chorus Pro invoice workflow

This workflow will issue an invoice through Chorus Pro.

Copy and paste this code into a new Empty Invoice workflow code view.

Example Chorus Pro invoice workflow with states

{
    "name": "Send to Chorus Pro",
    "description": "Generate and send invoice to Chorus Pro using CII",
    "steps": [
        {
            "id": "241c1b60-4cec-11f0-bcdc-61b84b5eeae8",
            "name": "Set State",
            "provider": "silo.state",
            "summary": "Set state to `processing`{.state .processing}",
            "config": {
                "state": "processing"
            }
        },
        {
            "id": "0dba81f0-4ba1-11f0-a0a5-bbd7c9d8117a",
            "name": "Sign Envelope",
            "provider": "silo.close"
        },
        {
            "id": "3d048690-4ba1-11f0-a0a5-bbd7c9d8117a",
            "name": "Generate UN/CEFACT CII Invoice",
            "provider": "cii.generate",
            "summary": "Chorus Pro V1",
            "config": {
                "doc_type": "choruspro-v1"
            }
        },
        {
            "id": "2cd30490-4ba1-11f0-a0a5-bbd7c9d8117a",
            "name": "Send an invoice to Chorus Pro",
            "provider": "chorus-pro.send"
        },
        {
            "id": "282dac00-4cec-11f0-bcdc-61b84b5eeae8",
            "name": "Set State",
            "provider": "silo.state",
            "summary": "Set state to `sent`{.state .sent}",
            "config": {
                "state": "sent"
            }
        }
    ],
    "rescue": [
        {
            "id": "2b9c6cf0-4cec-11f0-bcdc-61b84b5eeae8",
            "name": "Set State",
            "provider": "silo.state",
            "summary": "Set state to `error`{.state .error}",
            "config": {
                "state": "error"
            }
        }
    ]
}

In Console create a new workflow and select Empty Invoice workflow in the template selector. Add the following steps:

Generate UN/CEFACT CII Invoice - Select Chorus Pro V1 as the Invoice Output Document Type.
Send an invoice to Chorus Pro.

In the Error Handling section, add the Set State action and select Error.

Keep the workflow ID at hand as you’ll need it later.

Chorus Pro Credentials

This section explains what suppliers need to configure within their Chorus Pro account to enable integration with Invopop.

To configure Chorus Pro, complete these steps:

Create a Chorus Pro account - Sign up for a Chorus Pro account if you don’t have one.

To test in sandbox mode, create an account in the Chorus Pro sandbox. Download a CSV file with test accounts. Use one of the accounts to log in.

For more information, visit the Chorus Pro documentation.

Navigate to API settings - Once logged in to your Chorus Pro account, navigate to the API configuration area:
- Go to Domains > Connections in the main menu
- Click Access Service in the Technical Account section (bottom left)
  This opens a new page where you can manage your technical accounts.
Create technical account - Set up the technical account credentials:
- This opens a form to create a technical account:
  - Set the type of request to Creation of a technical account
  - Select your company in the company field
- This creates a login and password - copy these credentials as you’ll need them when registering with Invopop
- Click Submit to complete the setup

Return to Invopop for the next steps.

Running

Now you’ll learn how to register a supplier and issue Chorus Pro invoices:

Register a Supplier

Now that you have a technical account, register a supplier with Chorus Pro.

Upload a Supplier

Use the Create an entry endpoint to upload a new supplier. Include a party object in the data field. For this step, you only need the VAT number.

After successful upload, you’ll see the supplier in the Contacts section with status Empty.

Send the Supplier to the registration workflow

Send the supplier to the registration workflow using the Create a job endpoint. Use:

The supplier’s silo entry UUID from the previous step
The Supplier Registration workflow ID from the Setup section

This workflow generates a unique URL for the supplier to access and complete the registration process. The URL is stored in the supplier’s metadata.

Complete Chorus Pro Authentication

The workflow stays in progress until the supplier completes the registration process. The supplier must access the link and add the credentials they created previously.

The supplier’s status will change to Registered when authentication is complete.

Send an Invoice

Once a supplier is registered, you can send invoices to French public institutions through Chorus Pro.

Create an Invoice

Use the Create an entry endpoint to create a new invoice. Include an invoice object in the data field.

Example B2G invoice

Chorus Pro B2G Invoice

{
	"$schema": "https://gobl.org/draft-0/envelope",
	"head": {
		"uuid": "8a51fd30-2a27-11ee-be56-0242ac120002",
		"dig": {
			"alg": "sha256",
			"val": "4dde30dddc3c585d881c399680842e7167a5619457fc27cf84ca48c22b41af45"
		}
	},
	"doc": {
    "$schema": "https://gobl.org/draft-0/bill/invoice",
    "$regime": "FR",
    "$addons": [
        "eu-en16931-v2017",
        "fr-choruspro-v1"
    ],
    "uuid": "019783e7-33b1-7000-a1a5-6139e214b447",
    "type": "standard",
    "series": "SAMPLE",
    "code": "2345",
    "issue_date": "2025-06-18",
    "currency": "EUR",
    "tax": {
        "ext": {
            "fr-choruspro-framework": "A2",
            "untdid-document-type": "380"
        }
    },
    "supplier": {
        "name": "Provide One Inc.",
        "tax_id": {
            "country": "FR",
            "code": "43498927917"
        },
        "identities": [
            {
                "type": "SIRET",
                "code": "49892791768734"
            }
        ],
        "addresses": [
            {
                "num": "42",
                "street": "Calle Pradillo",
                "locality": "Madrid",
                "region": "Madrid",
                "code": "28002",
                "country": "ES"
            }
        ],
        "emails": [
            {
                "addr": "billing@example.com"
            }
        ],
        "ext": {
            "fr-choruspro-scheme": "1"
        }
    },
    "customer": {
        "name": "Sample Consumer",
        "tax_id": {
            "country": "FR",
            "code": "39356000000"
        },
        "identities": [
            {
                "type": "SIRET",
                "code": "35600000012345"
            }
        ],
        "addresses": [
            {
                "num": "1",
                "street": "Rue Sundacsakn",
                "locality": "Saint-Germain-En-Laye",
                "code": "75050",
                "country": "FR"
            }
        ],
        "emails": [
            {
                "addr": "email@sample.com"
            }
        ],
        "ext": {
            "fr-choruspro-scheme": "1"
        }
    },
    "lines": [
        {
            "i": 1,
            "quantity": "20",
            "item": {
                "name": "Development services",
                "price": "90.00",
                "unit": "h"
            },
            "sum": "1800.00",
            "discounts": [
                {
                    "reason": "Special discount",
                    "percent": "10%",
                    "amount": "180.00"
                }
            ],
            "taxes": [
                {
                    "cat": "VAT",
                    "rate": "standard",
                    "percent": "20%",
                    "ext": {
                        "untdid-tax-category": "S"
                    }
                }
            ],
            "total": "1620.00"
        }
    ],
    "payment": {
        "advances": [
            {
                "description": "Paid in full",
                "percent": "100%",
                "amount": "1944.00"
            }
        ],
        "instructions": {
            "key": "card",
            "card": {},
            "ext": {
                "untdid-payment-means": "48"
            }
        }
    },
    "totals": {
        "sum": "1620.00",
        "total": "1620.00",
        "taxes": {
            "categories": [
                {
                    "code": "VAT",
                    "rates": [
                        {
                            "key": "standard",
                            "ext": {
                                "untdid-tax-category": "S"
                            },
                            "base": "1620.00",
                            "percent": "20%",
                            "amount": "324.00"
                        }
                    ],
                    "amount": "324.00"
                }
            ],
            "sum": "324.00"
        },
        "tax": "324.00",
        "total_with_tax": "1944.00",
        "payable": "1944.00",
        "advance": "1944.00",
        "due": "0.00"
    }
	}
}

Review the example above. Notice that you need both the eu-en16931-v2017 and the fr-choruspro-v1 addon. These addons enable all the necessary validations in your GOBL invoice.

Send to Chorus Pro

Send the invoice to Chorus Pro using the Create a job endpoint. Use:

The invoice’s silo entry UUID from the previous step
The Chorus Pro Invoice workflow ID from the Setup section

The system generates a CII XML file with Chorus Pro extensions and submits it to the platform.

Track Invoice Status

After submission, track your invoice in Chorus Pro using the invoice identifier (series plus code).

Chorus Pro allows document modifications after submission. If a document is rejected or contains errors, update the GOBL details and resubmit to the same workflow until the document is accepted. Once accepted, do not modify the invoice.

The invoice identifier in Chorus Pro corresponds to your GOBL invoice series and code combined. This identifier helps you locate and track invoices across both systems.

FAQ

What invoice formats does Chorus Pro support?

Do I need a SIRET number to use Chorus Pro?

Can I modify invoices after sending to Chorus Pro?

How do I find my invoice in Chorus Pro?

What happens if my supplier registration fails?

Are there file size limits for Chorus Pro invoices?

Getting Started

Use Cases

Feature Guides

Country Guides

Integrations

France · Chorus Pro Guide

Introduction

What is Chorus Pro?

Understanding Chorus Pro Format Requirements

Setup

Chorus Pro supplier registration workflow

Chorus Pro supplier registration workflow

Chorus Pro invoice workflow

Chorus Pro invoice workflow

Chorus Pro Credentials

Running

Register a Supplier

Send an Invoice

FAQ

Getting Started

Use Cases

Feature Guides

Country Guides

Integrations

​Introduction

​What is Chorus Pro?

​Understanding Chorus Pro Format Requirements

​Setup

Chorus Pro supplier registration workflow

Chorus Pro supplier registration workflow

Chorus Pro invoice workflow

Chorus Pro invoice workflow

​Chorus Pro Credentials

​Running

​Register a Supplier

​Send an Invoice

​FAQ

Introduction

What is Chorus Pro?

Understanding Chorus Pro Format Requirements

Setup

Chorus Pro Credentials

Running

Register a Supplier

Send an Invoice

FAQ