How i can bypass the homepage of an external site?

Good morning to everyone, this is my first time here so please be good with me and my english! :slight_smile:
I’ve to add a function on my website, i should use (on a specific page) a login box for an external site (for insert orders, history order, pricelist etcetera).
I must add this login box for bypass the homepage of this external site, so that the user open directly his control panel.
On this box you must input username and password and linking to the external site, if the login it’s correct the result will be a string containing the token which must then be passed on the next call to log in to the portal.
I hope i’m making myself crystal clear on that point.
Thanks in advance for the help,
Regards,
Loris

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