Code Reference

Copy and paste the following snippet into your child theme’s functions.php to automatically typecast values. Feel free to modify the code as needed.

add_filter('automator_send_webhook_data_format', function( $fields, $original, $data_type ) {

	$fields_arr = json_decode( $fields, true );
        // Add your the field value to cast.
	$casted = array(
		'true' => true,
		'false' => false,
		'null' => null,
		'undefined' => null
	);

	$casted_fields = array();

	if ( ! empty( $fields_arr ) ) {

		foreach( $fields_arr as $field_key => $field_val ) {

			$value = $field_val;

			if ( in_array( $field_val, array_keys( $casted ) ) ) {
				$value = $casted[$field_val];				
			}

			// Example, cast numeric to integer.
			if ( is_numeric( $field_val ) ) {
				$value = intval( $field_val );
			}

			$casted_fields[$field_key] = $value;
		}
		
	}

	if ( ! empty( $casted_fields ) ) {
		return wp_json_encode( $casted_fields );
	}
	
	return $fields;

}, 10, 3 );