title: Stripe.Net json parsing error on create.refund
body: <p>Hi i have code for a webhook that refuneds a customer, testing api works fine in test mode, but while still in tested mode i actually refund a dummy transction and i get this error</p>
  
  <p>Unexpected character encountered while parsing value: {. Path 'request', line 111, position 14.</p>
  
  <p>Appreciate any help : ) thanks you</p>