paypal - empty related_resources in response from credit card payment -

i'm using paypalrestsdk credit card payment. when switch sandbox mode , make request, paypal service return me this:

{'update_time': u'2016-11-17t16:47:46z', 'payer':       {'payment_method': u'credit_card',      'funding_instruments': [             {'credit_card':                    {'first_name': u'first_name',                   'billing_address': {'city': u'london', 'postal_code': u'123','line1': u'fooo', 'country_code': u'en'},                   'expire_month': u'12',                   'number': u'xxxxxxxxxxxx1111',                   'last_name': u'last_name',                   'expire_year': u'2020',                   'type': u'visa'}}]}, 'links': [        {'href': u'https://api.sandbox.paypal.com/v1/payments/payment/pay-1gh35642k71421451law56mq',        'method': u'get',        'rel': u'self'}  ],  'transactions': [          {'item_list': {                'items': [                        {'currency': u'usd',                        'price': u'367.77',                        'name': u'foooo',                        'quantity': u'10'}],                 'shipping_address': {'city': u'london', 'line1': u'line1', 'recipient_name': u'name', 'phone': u'321312', 'state': u'state', 'postal_code': u'123', 'country_code': u'en'}},                 'related_resources': [],                 'amount': {'currency': u'usd', 'total': u'3688.77', 'details': {'subtotal': u'3677.70', 'shipping': u'11.07'}},                 'description': u'charge order: #1'}], 'state': u'created', 'create_time': u'2016-11-17t16:47:46z', 'intent': u'sale',  'id': u'pay-1gh35642k71421451law56mq'} 

why related_resources empty? how can test code in sandbox mode? of course in production mode related_resources contain sales in example: https://developer.paypal.com/docs/integration/direct/accept-credit-cards/

the number of credit card 4111111111111111.

4111111111111111 not working anymore, can try other 1 4929931129414294