email = 'donor@example.com'
card_token = '123'
plan_name = 'magazine'  #in Stripe it's a plan with interval 3 months and amount 1.0
amount = 12
today = Time.now
trial_end = today.beginning_of_quarter.to_date.eql?(today.to_date) ? nil : today.end_of_quarter + 2.seconds

customer = Stripe::Customer.create(email: email, source: card_token)
subscription = Stripe::Subscription.create(customer: customer.id, items: [{plan: plan_name, quantity: amount}])
unless trial_end.nil?
  subscription.delete(at_period_end: true)
  subscription = Stripe::Subscription.create(customer: customer.id, items: [{plan: plan_name, quantity: amount}], trial_end: trial_end)
end