When I click on "Connect" button, connecting immediately.

I made a sample form to try connecting with my Stripe account, but all I had to do is click in connect with Stripe and then shows that my account is connected, but how can you connect with my Stripe account without API keys?

Please note that when you click on the"Connect", it opens a new window for Stripe authentication. If you are already logged in to you stripe account in another browser tab, authentication window will not ask you to login to your Stripe account. If you are not logged in to your Stripe account in another browser tab, authentication window will as you to login to your account. 

Please check the screenshot below which will explain you this. First I tried to integrate with Stripe but I am not logged in to Stripe in another browser and it ask me to sign in to my Stripe account. Then again I login to my stripe account in another browser and then try to integrate again and you will see it shows already logged in:

Once you connect payment tool with stripe account, it will automatically use API in the background and you do not have to explicitly add API keys.

Hope this helps.

Do get back to us if you have any questions.