pay pal setup

Cheers

Can someone tellme what I have to select for the pay pal adaptive payments..
The process does not work the same anymore from the forum topic…they ask you all the same questions when applying for the business account now..no developer URL…this is what they are asking and not sure which selection I need ..as they now call this API method classic on site…its older compared to whatever they do now..

2. Why is there an API in my paypal already on my site after I downloaded from premiumpress (the gateway plugin)..is this just some default….?

Thanks in advance!

Here is what the paypal page asks and says

API credentials consist of three elements:

An API username
An API password
Either an API signature or an API SSL client-side certificate

If you’re using a shopping cart or solution provider, ask whether you need an API signature or a certificate.

1. Request API signature if your shopping cart or solution provider has asked for an API username, password, and signature, or if you’re developing a custom shopping cart.

2.Request API certificate if your shopping cart or solution provider requires a file-based certificate.

setups are different now..so unsure which to select and if there may be more after this selection..when I hit continue…do I select 1 or 2?

Ian (julian)