anchor.diff:  Notes:
   
   * You can call this endpoint multiple times for partial captures (all of these captures will share the same direct payment id)
  +* You can specify in the body an *externalKey* string (represents a unique identifier in an external system)
   
   ==== Purchase
   
  
positive.code:      --data-binary '{"amount":"5","currency":"USD"}' \
       "http://127.0.0.1:8080/1.0/kb/directPayments/078a4500-d15e-11e3-9c1a-0800200c9a66/credits"
  ----
  
  === Hosted pages helpers
  
  
negative.code: Notes:
  
  * You can specify another payment method (other than the default one) via the *kbPaymentMethodId* query parameter
  * You can specify in the body an *externalKey* string (represents a unique identifier in an external system)
  
  ==== Void
  
  