Generate invoices

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generateInvoice renders an invoice of an account for a period you choose, the same as Generate Invoice in the account’s Billing menu. validateInvoiceTemplate fills an invoice template with sample data, so you can check a template, or show a preview of it, before you use it. Both return the PDF as a base64 string.

Both methods support trusted mode with i_customer.

`generateInvoice`

Renders an invoice of an account with the account’s invoice template.

Parameters

Name	Type	Required	Description
`i_account`	int	yes	ID of the account
`period_begin`	string	yes	Start of the period, in UTC, in the format `HH:MM:SS.000 GMT Ddd Mmm DD YYYY`, for example `00:00:00.000 GMT Thu Jan 01 2026`
`period_end`	string	yes	End of the period, in the same format
`i_billing_plan`	int	no	Service plan to bill the period with. Default: the account’s current service plan

Returns

Name	Type	Description
`result`	string	`OK`
`pdf`	string	The invoice as a PDF file, base64-encoded

Example

import base64

res = call("generateInvoice", {
    "i_account": 3092,
    "period_begin": "00:00:00.000 GMT Thu Jan 01 2026",
    "period_end": "00:00:00.000 GMT Sun Feb 01 2026",
})
with open("invoice-3092-2026-01.pdf", "wb") as f:
    f.write(base64.b64decode(res["pdf"]))

{"result": "OK", "pdf": "JVBERi0xLjQK…"}

`validateInvoiceTemplate`

Fills a template with sample data and checks that it renders. With return_pdf it also returns the rendered PDF as a preview.

Parameters

Name	Type	Required	Description
`template`	string	yes	The HTML of the template, base64-encoded
`template_css`	string	no	The CSS of the template, base64-encoded
`converter_options`	string	no	Extra options for the PDF converter. The panel sends an empty string
`return_pdf`	boolean	no	`True` returns the rendered preview in `pdf`. Default: `False`

Returns

Name	Type	Description
`result`	string	`OK` when the template renders
`pdf`	string	The preview as a PDF file, base64-encoded; only with `return_pdf`

A template that cannot be rendered returns a fault. The panel shows it as Wrong Invoice Template parameters. when you save a template.

Example

import base64


def b64(path):
    with open(path, "rb") as f:
        return base64.b64encode(f.read()).decode()


call("validateInvoiceTemplate", {
    "template": b64("invoice.html"),
    "template_css": b64("invoice.css"),
    "converter_options": "",
    "return_pdf": True,
})

{"result": "OK", "pdf": "JVBERi0xLjQK…"}

Invoicing: invoices and templates in the panel, and the list of macros
Invoice templates
Service plans

Generate invoices