Ask Diffy to capture the project's pages from a site at an address you give, the custom environment. The site must be reachable from Diffy.
Diffy API: POST projects/{id}/screenshots
Examples
Then create diffy screenshot from the custom environment "https://stage.example.org"
And create diffy screenshot from the custom environment "https://www.un.org"
Then I create diffy screenshot from the custom environment "https://pr-42.example.org"
Then we create diffy screenshot from the custom environment "https://example.org"
But I create diffy screenshot from the custom environment "https://example.net"
Pattern
Then(/^(I |we )*create diffy screenshot from the custom environment "([^"]*)"$/, …)
Part of @webship-js/diffy-steps (github.com/webship/diffy-steps), a step pack for Webship-js 2.0.x.