What is the best way to import >5 million records of customer into commerce tools?
I only need it to load initial load but I don't need any sync services between external sources and commercetools multiple times
process of finding delta can be done outside.
I went through the import API documentation https://docs.commercetools.com/import-export/
#option 1: Impex UI, I believe its node backed application. Does it uses Import API?
#option 2: Project Sync. It uses Import API and abstract batching, http request etc
#option 3: Import API SDK. It abstract http request
With large dataset to import for initial load, it sounds like #2 Project sync would be better choice since it has batching. It looks like it calculates delta before syncing to commercetools which I dont need since I want to use it for initial load.
Which option should i use?