problem with "recur_amount"

Hi, I am testing recurring billing in php.

Here is my transaction array


Here is my recurring array
"start_date"=> date('Y/m/d', strtotime('+1 year')),
For the test, I am using 4242424242424242
Here is the message that I get after I send the https request : 
"Error unfinished element 'recur_amount"
  • I forgot to add the data_key in the transaction array. Now I am getting a different message:

    "Cancelled: null"