For a market exchange, there are 2 options :
OAuth2 - this is the easiest option, you will be asked to connect to your account, it is the most secured way as it goes directly to the market exchange
API key - you will have first to create an API key and API secret in your account, and you will set up the level of authorisations to make sure it is fully secure
For a wallet, you will be asked to enter your public key and our blockchain explorer will fetch all your transactions.
For more information, please read each user guide for each market exchange / wallet.
To make things easier, we recommend to copy-paste the information from the website in a email and then use them from your mobile handset.