if I am using sub account’s API key and secret, can I do:
Disassociate a sub account from the master account
2.Update a sub account’s options
3.Retrieve a sub account’s settings
4.Update a sub account’s settings
or I have to use master account’s API key and secret to do it?
You should use master account’s api key/secret to do the following things.
Disassociate a sub account from the master account
2.Update a sub account’s options
3.Retrieve a sub account’s settings
4.Update a sub account’s settings