How to use paypal API credentials with srmklive laravel package

Not sure if you can help here but I would really appreciate if you could. I am using the srmklive package for Laravel and have set up a sandbox account on the Paypal API dashboard and it works. I am trying to port it over to use the customer's live business account on Paypal but I can't map across the API credentials. The sandbox uses the following:

PAYPAL_CLIENT_ID=
PAYPAL_CLIENT_SECRET=
PAYPAL_MODE=

But all I see when I generate the details on Paypal business account is

API Username
API Password
Signature

I don't know if these sets of details are equivalent or if there is something else I need to be doing?