phone_number, customer_name, header_media_id, params_1, params_2

phone_number

RequiredRecipient's phone number including country code, without+ (e.g., 62812345678).
Example: 62812345678

customer_name

RequiredRecipient's name used in {{customer_name}} placeholder. Example: Aisyah

header_media_id

OptionalMedia ID for templates with media headers. Leave blank if not applicable. Example: 1955615274999722 or 1512682986516314.
Media ID must match the ID available on the Media page.

params_1

OptionalFirst parameter for variable substitution. Leave blank if unused. Example: Product Name

params_2

OptionalSecond parameter for variable substitution. Leave blank if unused. Example: Order #12345

Note: Columns header_media_id, params_1, and params_2 may be left empty if unused, but column headers must remain in the file.