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$defaults = array( 'name' => $name, 'display_title' => $tax_type['title'], 'description' => '', 'display_inclusive' => FALSE, 'round_mode' => COMMERCE_ROUND_NONE, 'rule' => 'commerce_tax_type_' . $name, 'module' => $module, );
but the hook docs example code just has:
$tax_types['sales_tax'] = array( 'title' => t('Sales tax'), 'display_inclusive' => FALSE, );
and the docblock:
* - title: the title of the tax type * - display_title: a display title for the tax type suitable for presenting * to customers if necessary; defaults to the title * - description: a short description of the tax type * - display_inclusive: boolean indicating whether or not prices containing * this tax will include the tax amount in the displayed price; defaults * to FALSE * - rule: name to use for a default product pricing rule that calculates * taxes of this type for line items; defaults to 'commerce_tax_type_[name]' * but can be set to NULL to not create any default Rule * - admin_list: boolean defined by the Tax UI module determining whether or * not the tax type should appear in the admin list