This is the array before add()
Array ( [resource] => specific_prices [postXml] => <?xml version="1.0" encoding="UTF-8"?> <prestashop xmlns:xlink="http://www.w3.org/1999/xlink"> <specific_price> <id_shop_group>0</id_shop_group> <id_shop>1</id_shop> <id_cart>0</id_cart> <id_product>594</id_product> <id_product_attribute>0</id_product_attribute> <id_currency>0</id_currency> <id_country>0</id_country> <id_group>0</id_group> <id_customer>0</id_customer> <id_specific_price_rule>0</id_specific_price_rule> <price>-1</price> <from_quantity>1</from_quantity> <reduction>0.2</reduction> <reduction_tax>1</reduction_tax> <reduction_type>percentage</reduction_type> <from>0000-00-00</from> <to>0000-00-00</to> </specific_price> </prestashop> )