I have installed bd API on site A and bd API consumer on site B. On site A I have Enable CORS and Restrict Access. I added a client, with key & secret and whitelisted the URL of site B. What should I fill in for redirect URL? On site B I added key and secret. Enabled auto register and auto login. Nothing else. Site A has 250k users. Site B has 200k users which were imported from site A. I want to get the additional 50k users from site A into site B. I want the accounts in site B updated with the password information of site A. I don't need anything else to be passed from site A to B. How do I proceed? Do I need to do anything with tokens or auth codes? How does the system handle similar accounts?