Acumulus plugin filters and actions
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The Acumulus plugin defines 2 filters and 1 action:

1) filter acumulus_invoice_created
2) filter acumulus_invoice_send_before
2) action acumulus_invoice_send_after

See the example plugin acumulus_customise_invoice for usage and documentation.
You can download this example extension from the Acumulus forum at
https://forum.acumulus.nl/index.php/topic,3984.0.html.