Sherlocks
Sherlocks add-on include translation files for French language. If your website/user is in French, you will see the admin and the front-end already translated to French.
1. Activate Sherlocks as payment gateway
Once you have activated Sherlocks plugin, you need to validate the licence in HBook > Licence.

Set Sherlocks as active payment gateways in HBook > Payment > Active payment gateways.
2. In HBook, add Sherlocks credentials
Set if you are in "Test" or "Live" mode in HBook > Payment > Sherlocks settings.
If you are in Test environment, there is no other settings needed.
If you are in Live environment, you will need to add the following information. The Merchant ID is provided by BNP Paribas Sherlocks.
Where to find the Secret Key and Version Key for Live environment?
You will find instructions to retrieve your Secret Key and Version Key here on BNP Paribas Sherlocks documentation.
Which Test cards to use?
You can find the test card details in this section from LCL Sherlocks documentation.