API reference
Tags and custom fields
Tags are a string list. Custom is a string map.
Tags are a list of labels, such as Repeat buyer or COD pending. A broadcast can target one tag.
Custom fields are a free-form object: city, last order id, or the date someone agreed to hear from you.
CSV import expects a header row with name and phone. Optional columns are email, tags separated by |, and anything else, which becomes a custom field.