Follow the below steps for generating an api key -
2. Make sure you have activated the plugin in the WordPress Plugin Manager
3. Click on Vouch to edit the settings.
4. Add the Api key that you receive from vouch.
5. Add Your Online Store name field(this is the common prefix for all the vouch gigs from your site).
6. Click on save changes(make sure that you add the api key and your store name fields as they are mandatory)