[Sequence diagram] Create 3 sequence diagram for following 3 usage scenario.

My Project: drive.google.com/drive/folders/0Bz-X3EXA0Q75a0xKUHF4VVI2N0k

- Use program logics e.g. iteration or loop (for / while) , Condition (if-else): Option and Alternative

- You can use Astah to create the sequence diagram. (astah.net/editions/community)

Hint: drive.google.com/open?id=0Bz-X3EXA0Q75SUM0NDJtRXNzeDg

>>> Please clearly create sequence diagram

Use Case Buy Project Main Success Scenario Actor Input System Response 1. User login to the website 2. User choose idea that liked o interested 3. User buy the project from another user 4. The system prompts the user to confirm the purchase 5. user confirm to purchase the project 6.The system check the credit of user 7.The system transfer credit from buyer to seller. 8.The system record the detail in purchased list 9. The system notities the user that the purchase is complete Extensions Actor Input System Response 6a. The system has detected that the user has not enough credits to buy the project. 1.The system suggest user to top-up 2. User entered to top-up page 3. Return to Main Success Scenario step 7a. The system cannot transfer credit to the seller 1. The system cancel the purchase and refuno credit to the user 2. The system notifies the user that transaction was cancel because of an error. User has to re-purchase the project. 3. Return to Main Success Scenario step