Added Address section with Cash App details.

Tagging-Merchants.md

@@ -123,6 +123,14 @@ If a Companion App is required then the following tags should be used:
 `payment:lightning:companion_app_required=yes`
 
 `payment:lightning:companion_app_url:https://app-url-com`
+
+### Addresses
+
+The address tags should be filled out in accordance to local norms.
+
+Certain integrations require locations to have specific address fields for locations to appear in their app. Known restrictions are:
+
+- Cash App requires: name, address number, address street and address city/suburb
  
 
 ### Legacy Tags