Hey Katie,
There is a filter for changing the display of the price on the product page:
/**
* Filter the output of the product's purchase price.
*
* @param string $price The price ready for output. May contain HTML.
* @param int $product_id The product ID.
* @param bool $sale Whether this is filtering the sale price amount or base price amount.
* @param bool $show_sale Whether the sale price will be displayed.
*/
$price = apply_filters( 'it_exchange_api_theme_product_base_price', $price, $product_id, false, $show_sale );
Likewise, if you want to append to the output (ie “includes tax”):
/**
* Filter the entire output of the product's purchase price.
*
* This includes both the sale price and base price parts.
*
*
* @param string $price The price ready for output. May contain HTML.
* @param int $product_id The product ID.
*/
$result .= apply_filters( 'it_exchange_api_theme_product_base_price_full', $price, $this->product->ID );
We are working to build out developer documentation, but that is not yet available.