To use Dropshare for macOS with WeTransfer, you need to obtain an API key from http://developers.wetransfer.com/.
Once you have created the API key, open the Preferences window and navigate to Connections. Click the Add Connection button and select WeTransfer. Copy the API key in the appropriate text field.
Click Test Connection and Dropshare will validate your API key. Afterwards, you are ready to share files with WeTransfer.
Please be aware that WeTransfer currently does not support landing pages as well as deleting uploads.