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Order Validation AddOn

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I would like to create an order validation add-on. 

The main features are:

  • Right before submitting the actual order on the prestashop, I would like to validate the stock of all the products on the order using an external webservice
  • This validation might also return different values for the delivery process due to remote service specific calculations.
  • If the order external validation process is successful, the order is placed immediately and if not, there should be a message on the order submission page and the order should be submitted or not, according to user selection.

Where should I start? I've already read addon documentation and now I'm looking at this addon wizard:


My questions using the generator are: 

  • What Module type should I use? A payment module? A generic module?
  • What could it be selected on the Module tab? Checkout ? Payments and Gateways?
  • On the last step, which Hook should I choose? (in what hook should I place my module).

Any help, ideias, etc, would be appreciated.





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