payments_controller.rb

credit_card = {
  :type => '[cc type, e.g. 'visa']',
  :number => '[cc number, from test account]',
  :verification_value => '123',
  :month => '[expiration month, from test account]',
  :year => '[expiration year, from test account]',
  :first_name => '[first name, can be anything]',
  :last_name => '[last name, can be anything]',
  :street_1 => '[street address, can be anything]',
  :city => '[city, can be anything]',
  :state => '[state, can be anything]',
  :country => '[use 'US' if you used a U.S. state code above]',
  :zip => '[zip code, can be anything]',
  :email => '[payor email address, can be anything]'
}

# I have the 'billing_start_date' set to one-month from today, but 
# this can be set to any date as long as it's not in the past
recurring = {
  :description => '[text description of the transaction]',
  :billing_start_date => Time.now.advance(:months => 1).iso8601,
  :periodicity => :monthly,
  :amount => [amount in cents],
  :auto_bill_outstanding_amount => true
}

# Initial payment is optional, read the PayPal API docs to learn more
initial = {
  :amount => [amount in cents]
}

# Trial is optional, read the PayPal API docs to learn more
trial = {
  :periodicity => :monthly,
  :total_billing_cycles => 1,
  :amount => [amount in cents]
}

currency = 'USD'

@response = GATEWAY.create_recurring_profile(
  :credit_card => credit_card, 
  :address => address, 
  :recurring => recurring, 
  :initial => initial, 
  :trial => trial,
  :currency => currency)