You can fetch product details like name, discription, price, images,etc using Amazon Standard Identification Number(ASIN) or through keywords.
You can use amazon-asin.php to fetch product details using asin, and use amazon-search.php to fetch product details using keywords.
For more details visit : https://webservices.amazon.com/paapi5/documentation/api-reference.html
Put your access key, secret key and associate tag on amazon-asin.php and amazon-search.php.