Add kyc sharing doc

Author: andregoncalvesdev

docs/customization.md

@@ -16,6 +16,8 @@ To skip this screen on initialization and go straight to authentication, simply
 |-------------------------|-------------------------|
 | <img src="/images/amount-selection-screen.jpg" alt="Amount selection screen" width="300"/> | <img src="/images/get-started-screen.jpg" alt="Authentication screen" width="300"/> |
 
+To pre-fill the email input on the authentication screen, add the `user_email` query parameter with the escaped email value.
+
 
 **What other initial screens are supported?**
 

docs/kyc-sharing.md

@@ -0,0 +1,13 @@
+---
+sidebar_position: 14
+---
+
+# KYC sharing
+
+To improve the onboarding experience, we provide a REST API that allows our business customers to share user KYC information directly with Topper.
+
+By receiving KYC details, Topper can reduce the amount of information requested from users, resulting in a faster and smoother KYC process.
+
+Currently, we support the following scopes: **email**, **profile**, **address**, **phone**, and **identity**.
+
+For more details, see the [KYC sharing documentation](https://developer.uphold.com/rest-apis/core-api/kyc/introduction).