App development for Shopify Plus client

I am working with a Shopify Plus merchant and they need some Theme App, Checkout UI extensions and some Functions. Is it possible to connect to their development store while developing/testing the app?

They’ll need to make a “Plus Sandbox Store” for app development. Here’s the docs: https://help.shopify.com/en/partners/dashboard/managing-stores/plus-sandbox-store

Thanks for your reply Shaun. This link on that page doesn’t work https://www.shopify.ca/plus/join-partners. Is there an updated link to be able to create a Shopify Plus Partner account?

Become a Shopify Partner Today - Shopify is the place to go to create a Shopify Plus Partner account

@Shaun_Stanworth

Do you still need to create a Plus Sandbox Store for app development or Shopify B2B customizations? From the Editions conference, it seems that all Shopify Partners now have access to Shopify Plus stores for building or selling. You can also create Shopify Plus development stores directly from your Partner Dashboard. What’s the difference between the two, and is the Plus Sandbox being phased out?

Thank You,
Diego