attach a product to a contact

[slechaix]

Hi

Is there a web service to attach or link a product to a contact ?

I'm migration from vtiger 5.4 to corebos 8 and I did made a web service for vt5.4.
But the same web service doesn't work anymore after migration.

In my CRM, a contact or customer can have multiple unique products identified by a serial number.
I'm using a POS application to create a contact in the CRM and to assign him a product.

thanks for your help