The Magento 1 link can be implemented as follows:
Go to Sources
Click on 'New Product source
Enter the following settings:
Name: the name of the source
Store url : the basic URL of the shop (for example https://mijnshop.com). Note: also indicate whether the shop uses the http or https protocol.
Link type: select 'Magento 1
API url : the base URL of the API endpoint (for example https://mijnshop.com/v1/api)
Consumer key : the consumer key of Magento 1
Consumer secret : the consumer secret of Magento 1
Oauth initiate url : the url of the oauth1 initiate request (for example https://mijnshop.com/oauth/initiate)
Oauth admin url : the url of the oauth1 login window ( https://mijnshop.com/oauth/admin/oauth_authorize for example)
Oauth token url: the url of the oauth1 token (for example https://mijnshop.com/oauth/token)
Click 'Save Product source
