Hi Ismail,

Here is our experience of getting Import2 app working with Group and Professional editions:

Preparation steps:

• You have to be Salesforce ISVForce partner
• Your app has to pass security review
• Your app is actually working on other editions that have API enabled.

Step 1. Login into your Developer org that you have used to create the app. and go to Setup ➤ Develop ➤ Remote Access. Create or click on the app that you want to whitelist. Copy paste the URL of Remote Access app, as you would need that when submitting a Case.

Step 2. Find your Developer Org Id. NB! it's an org where your app is registered, not the GE Org you are trying to connect. To find it go to Setup ➤ Administration Setup ➤ Company Profile ➤ Company Information ➤ Salesforce Organization ID

Step 3. Create an org to test if you have an access or not. We were getting different results on Test Org created through Partner Portal vs the org we created by requesting Group Edition trial on Salesforce page. Trust me, you would need that to test if your app was already whitelisted or not.

Step 4. Now submit a Case in partner portal. Use Case Type: AppExchange & Services Listing, Sub Type: Enable REST API for GE/PE Org. Be sure to mentioned your Remote Access id and Org ID that you have found during steps 1 and 2.

Step 5. We were informed that it takes 24 hours after you get notification that your app is whitelisted, but actually, it took 3-4 days for us until Group Edition access actually started to work.

Hope it helps.

Please mark this as best answer if it's resolved.

Best Regards,
Nagendra.P