Set custom field value on a single card.
update_card_field(card, field, key, value, ...)update_card_checkbox(card, field, value, ...)
update_card_date(card, field, value, ...)
update_card_dropdown(card, field, value, ...)
update_card_number(card, field, value, ...)
update_card_text(card, field, value, ...)
clear_card_field(card, field, ...)
Card ID
Custom field ID
Key for the value, e.g. "number" or "checked"
New value
Additional arguments passed to update_resource()
update_card_date requires ISO Formatted Datetime String. "YYYY-MM-DD" is
fine, but if you want also hour and timezone, use "YYYY-MM-DD hh:mm UTC+X",
e.g. "2018-12-24 16:00 UTC+1"
clear_card_field does not remove the field, but replaces its value with
the equivalent of "No selection"
Other functions to handle custom fields:
add_field_option(),
add_field(),
delete_field_option(),
delete_field(),
update_field()