ASINs from Amazon seller

Describe the problem - I was trying to scrape each individual ASINs from all listings of a seller on Amazon. So far, I was able to get the listing links, but can't seem to get the ASINs of the listing. Sometimes the ASINs differ in sizes drop down, like this one: https://www.amazon.com/ZSYQG-Shorts-Drawstring-Elastic-Athletic/dp/B07VL5VSXM/ref=sr_1_1?dchild=1&m=A19P7DX4W74DIU&marketplaceID=ATVPDKIKX0DER&psc=1&qid=1571692810&s=merchant-items&sr=1-1

Or in different color/design: https://www.amazon.com/IPhonexr-Cases-Mobile-Rubber-Silicone/dp/B07X56GFS6/ref=sr_1_1925?m=A19P7DX4W74DIU&marketplaceID=ATVPDKIKX0DER&qid=1571686201&s=merchant-items&sr=1-1925

Sometimes there are both situations: https://www.amazon.com/ZSYQG-Slippers-Sandals-House-Slides/dp/B07X965C4B/ref=sr_1_404?dchild=1&m=A19P7DX4W74DIU&marketplaceID=ATVPDKIKX0DER&psc=1&qid=1571685998&s=merchant-items&sr=1-404

Url: https://www.amazon.com/s?me=A19P7DX4W74DIU&marketplaceID=ATVPDKIKX0DER

Sitemap:
{"_id":"amazontong","startUrl":["https://www.amazon.com/s?i=merchant-items&me=A19P7DX4W74DIU&marketplaceID=ATVPDKIKX0DER&qid=1571685169&ref=sr_pg_1"],"selectors":[{"id":"items","type":"SelectorElement","parentSelectors":["_root","pagination"],"selector":"h2.a-size-mini","multiple":true,"delay":0},{"id":"itemtxt","type":"SelectorText","parentSelectors":["items"],"selector":"span","multiple":false,"regex":"","delay":0},{"id":"itemlink","type":"SelectorLink","parentSelectors":["items"],"selector":"a","multiple":false,"delay":0},{"id":"pagination","type":"SelectorLink","parentSelectors":["_root","pagination"],"selector":".a-pagination a:contains('Next')","multiple":true,"delay":0}]}