WC Vendors default manage stock, one-of-a-kind / only one in stock, sold out on purchase

functions.php

// Default value for manage stock? = yes

	add_filter( 'wcv_product_manage_stock', 'change_default_manage_stock' );
	function change_default_manage_stock() {

		$field['post_id'] = $post_id;
		$field['id'] = '_manage_stock';
		$field['wrapper_class'] = 'show_if_simple show_if_variable';
		$field['label'] = __( 'Manage stock?', 'wcvendors-pro' );
		$field['description'] = __( 'Enable stock management at product level', 'wcvendors-pro' );
		$field['type'] = 'checkbox';
		$field['value'] = 'yes'; // This checks the checkbox
		return $field;

	}

// Default value for sold individually = checked

	add_filter( 'wcv_product_sold_individually', 'change_default_sold_individually' );
	function change_default_sold_individually() {

		$field['post_id'] = $post_id;
		$field['id'] = '_sold_individually';
		$field['wrapper_class'] = 'show_if_simple show_if_variable';
		$field['label'] = __( 'Sold Individually', 'wcvendors-pro' );
		$field['desc_tip'] = 'true';
		$field['description'] = __( 'Enable this to only allow one of this item to be bought in a single order', 'wcvendors-pro' );
		$field['type'] = 'checkbox';
		$field['value'] = 'yes'; // This checks the checkbox
		return $field;

	}

// Default value for stock qty to 1

	add_filter( 'wcv_product_stock_qty', 'change_default_stock_qty' );
	function change_default_stock_qty() {

		$field['post_id'] = $post_id;
		$field['id'] = '_stock';
		$field['label'] = __( 'Stock Qty', 'wcvendors-pro' );
		$field['wrapper_start'] = '<div class="all-100">';
		$field['wrapper_end'] = '</div>';
		$field['desc_tip'] = 'true';
		$field['description'] = __( 'Stock quantity.', 'wcvendors-pro' );
		$field['type'] = 'number';
		$field['data_type'] = 'stock';
		$field['custom_attributes']['step'] = 'any';
		$field['value'] = '1'; // This sets the quantity to one
		return $field;

}