Hi Shantanu,
Could you confirm if what you wish to achieve is to create shoppings campaigns? If yes, you may refer to this
guide on how to link your Merchant Center account to your AdWords account. Also, please note that the campaign type (
AdvertisingChannelType) of these campaigns would be SHOPPING instead of DISPLAY.
As for creating dynamic remarketing ads, yes, that is the correct guide for reference. Should you have any further clarifications, feel free to write us back.
Thanks nad regards,
Peter
AdWords API Team