A rule to force to buy a product-type when you buy another product-type
I am stuck with a problem.
We sell phone numbers (VOIP). When a client buys a phone number, he must buy call credits.
There are many phone numbers (each one of theme is a product corresponding to a product-type). There are 4 different call-credits (corresponding to the "call-credit" product-type).
So for each VOIP number that the client buys, he must add a call credit of his choice (from 29 to 99 euro).
But I can't manage this... The system should look in the cart before the paiement if every DID has its corresponding Call-credit. You could set it as an option for the VOIP number but no! Because the VOIP number is -of course- a recurring product...
Is there a genius that could help? :-)
Thanks in advance.