Use Paywalls with Open WebUI

import re
from pydantic import BaseModel, Field

class Filter:
  class Valves(BaseModel):
      prefix: str = Field(
          default="webui",
          description="Prepended to every user handle to keep it unique per deployment.",
      )

  def __init__(self):
      self.valves = self.Valves()

  def inlet(self, body: dict, __user__: dict) -> dict:
      # Prefer username, then email user part, then fallback to the numeric WebUI id
      login = (
          __user__.get("username")
          or (__user__.get("email") or "").split("@")[0]
          or f"id_{__user__.get('id')}"
      )
      safe = re.sub(r"[^A-Za-z0-9_-]", "_", login) or "unknown"
      body["user"] = f"{self.valves.prefix}_{safe}"
      return body