To process a 3dcart migration, you need to use REST API in cart’s admin panel.
1. Go to Modules from the Admin panel of your 3dcart store
2. Find REST API module and press “+” button to expand
3. Click on “Change Settings”
4. Then press “Add” button and copy the following key c4c058b5bcd65352cf6c79d9931fcfdb into Public Key field
5. Click “Add” located on the right from Public Key field
6. Choose Authorize when you find LitExtension App
7. Continue migration setup by proceeding the migration wizard