Hi Guillaume, we have taken a look at the issue it seems that this is not supported in the Infusionsoft API. The link that you provided is for a Create Order Action. This is supported. However, what you want is to have PlanID exposed in a trigger event, which is not supported.
Send us a ticket, we will try our best to assist you with your problem
Productions La Voie du Coeur inc.
Add a "planID" data pill for the Create an Order and Update an Order triggers for Infusionosft
https://developer.infusionsoft.com/docs/xml-rpc/#order
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