Upload a CSV file or a ZIP file with a single CSV file in it to bulk
import subscribers. The CSV file should have the following headers
with the exact column names. attributes (optional)
should be a valid JSON string with double escaped quotes.
email,
name,
attributes
email, name, attributes
user1@mail.com, "User One", {'"{""age"": 42, ""planet"": ""Mars""}"'}
user2@mail.com, "User Two", {'"{""age"": 24, ""job"": ""Time Traveller""}"'}
{{ status.status }}
{{ status.imported }} / {{ status.total }} records