Question about app testing and GDPR web hooks for app submission

[triplesingle]

1. I have a draft Shopify app on my dev store linked to my Partner account. How would I transfer/move this draft app so that my friend can test it on his Partner account?

2. Are there any simple code walkthroughs with respect to implementing the mandatory GDPR webhooks for app submission (Link: https://shopify.dev/docs/apps/build/privacy-law-compliance)?