UserId Management
Creating a userId
A generated user_id is required to interact with the API.
This ID should be unique for each user and stored as part of your user record for:
- Future reference and transaction lookups
- Result validation
- Authentication (Verifier use cases) when applicable 
Important
- user_id must conform to this regex:
[a-zA-Z0-9'\\+_@\\.-]{1,256} - Do not use any identifiable information such as email addresses or Document ID numbers.
- We recomemend a GUID or UUID.
In cases where your implementationn does not require a distinct userId, you can repurpose this value to function as a session or transaction ID.