This web service asks me to login using my iTunes account to access to my purchase history of my purchased apps.
After logging in using my iTunes account, I have received an e-mail from Apple that my account maybe used by third-party user/apps.
I believe Apple does not allow other service to use iTunes account for login credential.
Is this service using illegal or near illegal method to access to my purchase history of my apps? Or does Apple provide an official API to access to its users purchase history?
I checked, but Apple doesn't seem to provide purchase history API.