It is important to note that resetting a particular PrestaShop module will reset all of it’s parameters. To reset a PrestaShop module, you will need to perform the following steps: Find the module you want to reset. From back office go to -> Modules and Services -> Search for Module you want to reset..
Here are the instructions on how to regenerate new API keys for the PrestaShop PayPal (free version) module: Step 1. Log into your PayPal account. Step 2. In back office of PrestaShop go to the PayPal module configuration screen. Click on ‘Get My Paypal Identification info button’ Step 3. Step 4. ..