Few important details on API /contacts/bulk_create/

Bulk create API has rate limit of 1 call per minute. So you can't call this API at high rates.
If your API request is throttled, we return the details of when the API is free to accept the next request.
All submitted imports will get processed one at a time. So even if you submit 5 CSV files by making the API call 5 times, the import will finish the first CSV file, then go for the second one, so on and so forth.
Either Upload file or CSV url is required.
Tags column in CSV should in format of comma separated tags.
Mapping is in format {"field":"index"}; E.g. if Contact No. is 3rd column in CSV Mapping is {"0":"2"}
Mapping for column to field is as follows:-
CONTACT = 0
MOBILE = 1
LAST_NAME = 2
FIRST_NAME = 3
EMAIL = 4,
COUNTRY_CODE = 5
ADDRESS = 6
CITY = 7
STATE = 8
ZIPCODE = 9
JOB_TITLE = 10
COMPANY_NAME = 11
COMPANY_WEBSITE = 12
NAME = 13
ADDITIONAL_VARS = 14
TAGS = 16

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