PayPal billing agreements REST API - how to start immediately

Question

How can I start charging a user the user immediately for a PayPal billing agreement?

Here\'s what I\'ve got so far.

1. Create a Billing Plan (POST .../payment

Answer 1

I used this date format working.

  $time = time();
  $startDate = date('Y-m-d\\TH:i:s\\Z', $time);