Hi 

You Can inherit the purchase.order model and add the confirm action inside the create action.

Try with this code

class PurchaseOrderInherit(models.Model):
    _inherit = 'purchase.order'


    @api.model
    def create(self, vals_list):
        purchase = super(PurchaseOrderInherit, self).create(vals_list)
        purchase.button_confirm()
        return purchase

Regards

@julien

is the a way to email the confirmed po? if i confirm the po with hand then i get an email with the ordered item. However when its automated i also get the email but the pdf does not show the product that needs to be ordered?