any tipe of call in need store name is required but what is store name?

[ar-narola]

No description provided.

[djp-narola]

you used is mws config (project/config/amazon-mws.php) parameter in define array structure in mention it.
i.e.
return [
'store' => [
'store1' => [
'merchantId' => '', //#Seller ID
'marketplaceId' => '',
'keyId' => '',
'secretKey' => '',
'authToken' => '*************',
'amazonServiceUrl' => 'https://mws.amazonservices.in/',

];

in store1 is your store name is just name for config file.