API Reference

Update a customer invoice

put
https://app.pennylane.com/api/external/v2/customer_invoices/

Update a customer invoice

This endpoint requires the following scope: customer_invoices:all

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Path Params
integer
required

The unique identifier of the customer invoice

Query Params
boolean
Defaults to true

If you are already using the X-Use-2026-API-Changes header, you can ignore this parameter.

The Pennylane API is introducing important changes, which will be rolled out in three phases: preview, sunset and cleanup.

For new user, please use this parameter with true value to opt in directly to the new version of the API.

Preview phase: From January 14th to April 7th 2026. Opt in by setting this attribute to true to test and migrate to the new behavior.

Sunset phase: From April 8th to June 30th 2026. The new behavior becomes the default. Set this attribute to false if you need additional time to migrate.

Cleanup phase: Starting July 1st 2026 The old behavior will no longer be available. You must have migrated by this point.

For more details, see our API documentation https://pennylane.readme.io/docs/2026-api-changes-guide for migration instructions.

Body Params
date

Invoice date (ISO 8601)

date

Invoice payment deadline (ISO 8601)

int64

Customer identifier

int64

The customer invoice template ID

string | null

For example, the contact details of the person to contact

string | null

Invoice title

string | null

Invoice description. Maximum 5,000 characters.

string

Invoice Currency (ISO 4217). Default is EUR.

string | null

Additional details. maximum 20,000 characters.

discount
object
string
enum

The local default is based on the thirdparty (customer / supplier ) billing_language . In case the customer is not present, we will default to the company locale.

Allowed:
invoice_lines
object

Add, update, delete invoice lines.

string | null

Custom label for the invoice used on accounting (ledger) entries. If not provided, Pennylane generates a label automatically.

string

The unique external reference that was assigned during creation either by you or Pennylane.

Responses

Updated 9 days ago

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Updated 9 days ago