If you are using the ECOM Module in RocketFusion, you need to get the "test" and "live" API keys for the merchant gateway you intend to use. RocketFusion supports Stripe, PayPal, and Authorize.net.
All three merchant gateways use a pair of API keys (essentially account number and password) for both "test" and "live" mode. We generally set up test keys first and run a few fake purchases to make sure the gateway is working, then flip to live mode.
Getting Ready to Copy / Paste the API Keys
RocketFusion has a "settings" page that can show all settings for every module as well as other aspects of your website. We will focus on the ECOM Module settings, here.
First off, of course, log into your website as the administrator.
Mouse-over the rocket icon in the very top left of your screen to get to the Admin Panel
Click on Site Settings, down near the bottom
Click on ECOM in the first column of links
In the list of settings, you'll want to focus on the ones shown in the image on this page:
Ecom Merchant (Stripe, PayPal, Authorize.net)
Ecom Merchant Mode (Live, Test)
Ecom Merchant Live Key 1 and 2
Ecom Merchant Test Key 1 and 2
For Ecom Merchant, choose the gateway you're going to use
Set Ecom Merchant Mode to Test for now
Copy and paste the API Keys (see below) to Live and Test Key 1 (public key / account) and Key 2 (secret key / password)
Obtaining PayPal API Keys
Go to PayPal.com and log in using your regular username (email address) and password
Mouse-over your name top right and click on Account Settings
Next to API Request click the Update link
Under REST API integration, click Manage REST API apps and credentials
To create an APP click PayPay Developer Experience
Under My apps & credentials click Live
Click Create app button, when asked, call it RocketFusion API
On the next page you'll see your PayPal account email and a Client ID.
Copy the Client ID and enter it into the Test Key 1 on your website's ECOM Settings
Under Secret click Show and copy the whole Secret string to Test Key 2