'context'     => [ 'view', 'edit' ],
                            ],
                            'date_created'      => [
                                'description' => __( "The date the image was created, in the site's timezone.", 'dokan-lite' ),
                                'type'        => 'date-time',
                                'context'     => [ 'view', 'edit' ],
                                'readonly'    => true,
                            ],
                            'date_created_gmt'  => [
                                'description' => __( 'The date the image was created, as GMT.', 'dokan-lite' ),
                                'type'        => 'date-time',
                                'context'     => [ 'view', 'edit' ],
                                'readonly'    => true,
                            ],
                            'date_modified'     => [
                                'description' => __( "The date the image was last modified, in the site's timezone.", 'dokan-lite' ),
                                'type'        => 'date-time',
                                'context'     => [ 'view', 'edit' ],
                                'readonly'    => true,
                            ],
                            'date_modified_gmt' => [
                                'description' => __( 'The date the image was last modified, as GMT.', 'dokan-lite' ),
                                'type'        => 'date-time',
                                'context'     => [ 'view', 'edit' ],
                                'readonly'    => true,
                            ],
                            'src'               => [
                                'description' => __( 'Image URL.', 'dokan-lite' ),
                                'type'        => 'string',
                                'format'      => 'uri',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'name'              => [
                                'description' => __( 'Image name.', 'dokan-lite' ),
                                'type'        => 'string',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'alt'               => [
                                'description' => __( 'Image alternative text.', 'dokan-lite' ),
                                'type'        => 'string',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'position'          => [
                                'description' => __( 'Image position. 0 means that the image is featured.', 'dokan-lite' ),
                                'type'        => 'integer',
                                'context'     => [ 'view', 'edit' ],
                            ],
                        ],
                    ],
                ],
                'attributes'            => [
                    'description' => __( 'List of attributes.', 'dokan-lite' ),
                    'type'        => 'array',
                    'context'     => [ 'view', 'edit' ],
                    'items'       => [
                        'type'       => 'object',
                        'properties' => [
                            'id'        => [
                                'description' => __( 'Attribute ID.', 'dokan-lite' ),
                                'type'        => 'integer',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'name'      => [
                                'description' => __( 'Attribute name.', 'dokan-lite' ),
                                'type'        => 'string',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'position'  => [
                                'description' => __( 'Attribute position.', 'dokan-lite' ),
                                'type'        => 'integer',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'visible'   => [
                                'description' => __( "Define if the attribute is visible on the \"Additional information\" tab in the product's page.", 'dokan-lite' ),
                                'type'        => 'boolean',
                                'default'     => false,
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'variation' => [
                                'description' => __( 'Define if the attribute can be used as variation.', 'dokan-lite' ),
                                'type'        => 'boolean',
                                'default'     => false,
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'options'   => [
                                'description' => __( 'List of available term names of the attribute.', 'dokan-lite' ),
                                'type'        => 'array',
                                'context'     => [ 'view', 'edit' ],
                                'items'       => [
                                    'type' => 'string',
                                ],
                            ],
                        ],
                    ],
                ],
                'default_attributes'    => [
                    'description' => __( 'Defaults variation attributes.', 'dokan-lite' ),
                    'type'        => 'array',
                    'context'     => [ 'view', 'edit' ],
                    'items'       => [
                        'type'       => 'object',
                        'properties' => [
                            'id'     => [
                                'description' => __( 'Attribute ID.', 'dokan-lite' ),
                                'type'        => 'integer',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'name'   => [
                                'description' => __( 'Attribute name.', 'dokan-lite' ),
                                'type'        => 'string',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'option' => [
                                'description' => __( 'Selected attribute term name.', 'dokan-lite' ),
                                'type'        => 'string',
                                'context'     => [ 'view', 'edit' ],
                            ],
                        ],
                    ],
                ],
                'variations'            => [
                    'description' => __( 'List of variations IDs.', 'dokan-lite' ),
                    'type'        => 'array',
                    'context'     => [ 'view', 'edit' ],
                    'items'       => [
                        'type' => 'integer',
                    ],
                    'readonly'    => true,
                ],
                'grouped_products'      => [
                    'description' => __( 'List of grouped products ID.', 'dokan-lite' ),
                    'type'        => 'array',
                    'items'       => [
                        'type' => 'integer',
                    ],
                    'context'     => [ 'view', 'edit' ],
                ],
                'menu_order'            => [
                    'description' => __( 'Menu order, used to custom sort products.', 'dokan-lite' ),
                    'type'        => 'integer',
                    'context'     => [ 'view', 'edit' ],
                ],
                'meta_data'             => [
                    'description' => __( 'Meta data.', 'dokan-lite' ),
                    'type'        => 'array',
                    'context'     => [ 'view', 'edit' ],
                    'items'       => [
                        'type'       => 'object',
                        'properties' => [
                            'id'    => [
                                'description' => __( 'Meta ID.', 'dokan-lite' ),
                                'type'        => 'integer',
                                'context'     => [ 'view', 'edit' ],
                                'readonly'    => true,
                            ],
                            'key'   => [
                                'description' => __( 'Meta key.', 'dokan-lite' ),
                                'type'        => 'string',
                                'context'     => [ 'view', 'edit' ],
                            ],
                            'value' => [
                                'description' => __( 'Meta value.', 'dokan-lite' ),
                                'type'        => 'mixed',
                                'context'     => [ 'view', 'edit' ],
                            ],
                        ],
                    ],
                ],
            ],
        ];

        return $this->add_additional_fields_schema( $schema );
    }

}