src/stores/class-papi-post-store.php
public function get_property( $slug, $child_slug = '' ) {
		$page_type_id = papi_get_page_type_id( $this->id );
		$page_type    = papi_get_entry_type_by_id( $page_type_id );

		if ( $page_type instanceof Papi_Page_Type === false ) {
			return;
		}

		if ( $property = $page_type->get_property( $slug, $child_slug ) ) {
			return $this->prepare_property( $property );
		}
	}
public function get_property( $slug, $child_slug = '' ) {
		$page_type_id = papi_get_page_type_id( $this->id );
		$page_type    = papi_get_entry_type_by_id( $page_type_id );

		if ( $page_type instanceof Papi_Page_Type === false ) {
			return;
		}

		if ( $property = $page_type->get_property( $slug, $child_slug ) ) {
			return $this->prepare_property( $property );
		}
	}
Load property from page type.

@param  string $slug
@param  string $child_slug

@return null|Papi_Core_Property