How to add custom field using API?

Question

I want to add a custom field use for activities (meeting)?
I did that using administrator -> customize data and screen -> custom fields
How can I achieve it by API 3.

Answer 1

Following API call should do it.

$result = civicrm_api3('CustomField', 'create', [ 'custom_group_id' => "GROUP_NAME", 'label' => "CUSTOM_FIELD_LABEL", ]);

Replace label and group name accordingly.

Answer 2

You can use the API CustomGroup create to create a custom group and the CustomField API to create a custom field. I'd recommend playing with the API explorer to get exactly what you need.