Magento :
Better inform client to install module in their end
-> If client insist us to install module, get the following details,
For magento 1 and 2 - Admin credentials along with ftp and/or ssh credentials and get details like whether they are using any repository to push code changes.
And check for rest api using following details, For Reference,
Magento 1 -> http://getbitoutdoors.com/api/rest/targetbay/products?page=1&limit=10 -> output will be like https://nimb.ws/fu7RtN
Magento 2 -> https://divers-supply.com/rest/V1/targetbay/listproducts?searchCriteria[current_page]=1&searchCriteria[page_size]=10 -> output will be like https://nimb.ws/IlXZFg
WooCommerce :
-> Get client admin credentials or the following
-> Need full access to support@targetbay.com
-> Get FTP details - MUST NEEDED
Shopify :
-> Get client admin credentials with full access or the following
-> Need full access to support@targetbay.com
Bigcommerce :
-> Client should install our app first from store as the store alone has permission to install app
-> Need full access to support@targetbay.com
3D Cart :
-> If client provides backend credentials, it should be with full access to install app in client backend or the following
-> Need full access to support@targetbay.com
Volusion :
-> Need super admin access to support@targetbay.com, to provide super admin access please inform client to refer the following article - https://helpcenter.