I've just started putting together a Magento module which bypasses the whole Magento checkout process and instead sends the cart details to a 3rd party fulfilment company via XML-RPC.
Not getting anywhere fast and could use a bit of guidance. My understanding is that I should create the module with an observer based on the event triggered by proceeding to checkout. Trouble is I can't work out which event that would be, I've been through the whole massive list here;
http://www.nicksays.co.uk/magento_events_cheat_sheet/
I've tried;
checkout_submit_all_after - fires after order processed successfully
checkout_cart_add_product_complete - fires after product added to cart
checkout_cart_save_before - fires after product added to cart
checkout_type_onepage_save_order - can't get this to fire at all
checkout_onepage_controller_success_action - fires after order processed successfully
I don't know if this means I'll have to create a custom event or if there is an entirely different and much better alternative to what I'm doing. Building and sending the XML I will leave to another question (starting to realise I may have my hands pretty full here) but any tips there gratefully appreciated too.
Thanks for any help.