0.3.0

[ADD] certification.get(Object)
[ADD] certification.delete(Object)
[ADD] vbank.create(Object)
[MODIFY] subscribe.getCustomers(Object) -> subscribe_customer.get(Object)
[MODIFY] subscribe.createCustomers(Object) -> subscribe_customer.create(Object)
[MODIFY] subscribe.deleteCustomers(Object) -> subscribe_customer.delete(Object)

0.2.0

refactored Iamport-sdk for resource extension mechanism
Token caching
implement all REST api functions
[MODIFY] getPaymentByImpUid(String) -> payment.getByImpUid(Object)
[MODIFY] cancelPayment(String) -> payment.cancel(Object)
[ADD] payment.getByImpUid(Object)
[ADD] payment.getByMerchant(Object)
[ADD] payment.getByStatus(Object)
[ADD] payment.cancel(Object)
[ADD] payment.prepare(Object)
[ADD] payment.getPrepare(Object)
[ADD] subscribe.onetime(Object)
[ADD] subscribe.again(Object)
[ADD] subscribe.schedule(Object)
[ADD] subscribe.unschedule(Object)
[ADD] subscribe.getCustomers(Object)
[ADD] subscribe.createCustomers(Object)
[ADD] subscribe.deleteCustomers(Object)

0.1.0

first version
Set code convention
Iamport constructor design
[ADD] getPaymentByImpUid(),
[ADD] cancelPayment(),
[ADD] getToken()