Overview of the externalshop code: https://www.loom.com/share/d5a1e61934114f2ca562c8f92006d4e4?sharedAppSource=team_library
To connect to Wisteria OAuth is used. There is example code for this and it is explained here: https://www.loom.com/share/c41e270007c54ea9a67f99d79dd36220?sharedAppSource=team_library
The Wisteria tests: https://www.loom.com/share/d3bdd7e8852b4c20958c45d22832849c?sharedAppSource=team_library
Add a merchant to your partner dashboard: https://www.loom.com/share/1be01ed729984325b9aacba4bb7cbcfc