from otree.api import * doc = """ Your app description """ class Constants(BaseConstants): name_in_url = 'payment_info' players_per_group = None num_rounds = 1 completion_code = '273940' class Subsession(BaseSubsession): # def creating_session(self): # for player in self.get_players(): # player.completion_code = Constants.completion_code pass class Group(BaseGroup): pass class Player(BasePlayer): completion_code = models.StringField(initial="273940") # PAGES class PaymentInfo(Page): pass page_sequence = [PaymentInfo]