What to use as the developer payload in Google In-App Billing APIs?

What to use as the developer payload in Google In-App Billing APIs?

References

Reference NO 1

http://stackoverflow.com/questions/15192184/what-to-use-as-the-developer-payload-in-google-in-app-billing-apis

Reference NO 2

http://stackoverflow.com/questions/16171786/android-in-app-billing-developer-payload

Reference NO 3

http://developer.android.com/google/play/billing/billing_best_practices.html

Reference NO 4

http://developer.android.com/google/play/billing/v2/billing_integrate.html

Reference NO 5

http://developer.android.com/google/play/billing/v2/billing_integrate.html

Reference NO 6

http://code.google.com/p/marketbilling/issues/detail?id=129

Reference NO 7

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Reference NO 8

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