How th make pagantion work with banggood site

i have manage to create a scraper for bangood but i dont know how ti implement the pagnation
i tried all tips shown in https://www.youtube.com/watch?v=x8bZmUrJBl0&feature=youtu.be
but when implement it return no result instand.

Url: http://eu.banggood.com

Sitemap:
{"_id":"bangood_electornic","startUrl":["https://eu.banggood.com/Wholesale-Warehouse-Electronics-c-Eu-1091.html"],"selectors":[{"id":"primary_cat","type":"SelectorLink","parentSelectors":["_root"],"selector":"a.left_nextCategories_button_170529","multiple":true,"delay":0},{"id":"subcat","type":"SelectorLink","parentSelectors":["primary_cat"],"selector":"li a.left_nextCategories_button_170529","multiple":true,"delay":0},{"id":"product_link","type":"SelectorLink","parentSelectors":["product_type"],"selector":".name a.middle_products_button_170529","multiple":true,"delay":0},{"id":"product_title","type":"SelectorText","parentSelectors":["product_link"],"selector":"h1","multiple":false,"regex":"","delay":0},{"id":"product_reviews","type":"SelectorText","parentSelectors":["product_link"],"selector":"span[itemprop='reviewCount']","multiple":false,"regex":"","delay":0},{"id":"product_ID","type":"SelectorText","parentSelectors":["product_link"],"selector":".productid b","multiple":false,"regex":"","delay":0},{"id":"product_sold","type":"SelectorText","parentSelectors":["product_link"],"selector":".sold b","multiple":false,"regex":"","delay":0},{"id":"product_stock_status","type":"SelectorText","parentSelectors":["product_link"],"selector":"div.status","multiple":false,"regex":"","delay":0},{"id":"product_price_usd","type":"SelectorText","parentSelectors":["product_link"],"selector":"b[itemprop='price']","multiple":false,"regex":"","delay":0},{"id":"product_price_old","type":"SelectorText","parentSelectors":["product_link"],"selector":"[itemprop='offers'] span.price_old","multiple":false,"regex":"","delay":0},{"id":"product_promotion","type":"SelectorText","parentSelectors":["product_link"],"selector":".accounting_date_t span","multiple":false,"regex":"","delay":0},{"id":"product_shipping_day","type":"SelectorText","parentSelectors":["product_link"],"selector":"#pro_ship_method div.shipping_time","multiple":false,"regex":"","delay":0},{"id":"product_shipping_type","type":"SelectorText","parentSelectors":["product_link"],"selector":"#pro_ship_method .shiping_state a","multiple":false,"regex":"","delay":0},{"id":"product_add_to_wishlist","type":"SelectorText","parentSelectors":["product_link"],"selector":".pro_wish_list u","multiple":false,"regex":"","delay":0},{"id":"product_warehouse","type":"SelectorText","parentSelectors":["product_link"],"selector":".pro_dt_shipping h5","multiple":false,"regex":"","delay":0},{"id":"product_shipping_cost_usd","type":"SelectorText","parentSelectors":["product_link"],"selector":"#pro_ship_method b","multiple":false,"regex":"","delay":0},{"id":"product_type","type":"SelectorLink","parentSelectors":["subcat"],"selector":"li a.left_nextCategories_button_170529","multiple":true,"delay":0},{"id":"product_image","type":"SelectorImage","parentSelectors":["product_link"],"selector":".pro_img_box img","multiple":false,"delay":0}]}