Your Requirements:
Need to build 16 Instagram accounts. Then create developer accounts for each of the 16 accounts with it's own API secret, key and access token.
I can gave you 16 Instagram accounts, their developer accounts, API secret key, access token, email-id dteails within 5-6 hours or sonner. Actually I have 5 Such accounts already. But if you want 16 fresh accounts, no problem.
This freelance account of mine is activated since over 1 yr, but I am focusing on "outsource" recently. Thus you can be our first client here. So you can get discount if you would like to become my permanent client.
Warm Regards.
P B Mishra