Add "activation" in the param of recurring payment init, so it will charge 1 immediately upon complete.

[lovesmall]

Related to issue #51.

I think current recurring payment won't charge immediately (for the first month) upon complete. And I found add a "activation" param to make it happen (am I wrong?). Since it's quite normal to charge immediately for recurring payments, maybe can add this option in the wiki docs?

Paypal::Payment::Recurring.new(
      start_date: SET_YOUR_OWN,
      description: SET_YOUR_OWN,
      activation: {
        initial_amount: SET_YOUR_OWN
      },
      billing: {
        period: :SET_YOUR_OWN,
        frequency: SET_YOUR_OWN,
        amount: SET_YOUR_OWN
      }
    )

[rgo]

Be careful, in our experience paypal sandbox doesn't work exactly as production. Recurring payments are done with a delay (one day or more).

If you use initial_amount in sandbox it works as expected more or less(it charges at the first time) but in production it charges both amounts(initial_amount + amount).

It seems to be the same experience for others users as you can read in this comment:

https://github.com/nov/paypal-express/issues/51#issuecomment-68234257

[lovesmall]

I've just check our current payment history, so far so good for production use with initial amount. No double charge on the first month. I'll check more detail later.