You can use the Fedex integration to display shipping methods and rates from Fedex at checkout. Start by searching on "Integrations". Click the search field on the upper left navigation menu and type to search "Integrations".
Navigate to "Integrations" under the Development section. In order to access and update "Integrations" you will need to be set up either as an "administrator" or a "superuser".
Click the "Show/Hide Columns" icon.
Select "User 1", "User 2", and "User 3" to have them appear in the grid. You will need to enter the required credentials in these fields.
Find "FedEx" in the listed integrations.
In the row for FedEx, enter the API key in "User 1" field, enter the Secret Key in "User 2", and the account number in "User 3". These credentials can be found from your account with Fedex.
Once you've entered your credentials, you can now click the "Activate Integration" icon to turn on the integration. This icon will turn green when activated.
Next, you will need to navigate to the Settings page by searching in the search bar with the term, "Settings".
Click "Settings".
Type in "ShippingEngine" in the search field.
Click on the more details icon.
Enter "FEDEX" into the value field.
Click the "Save" button to save your changes.
FedEx shipping rate will now appear on your commerce site. Please note that the default Fedex integration does expect your product weights to be populated in order to fetch accurate shipping rates from Fedex.