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It would be really cool to see a graph of the API usage over time with markers showing when each "stage" was occurring. I'm wondering if there were significant dips shortly after each stage, or if it was more of a gradual decline?

It would also be interesting to know if the API was still being used up until the final stage? Were there any ramifications/ angry customers at the door after that?

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Given the timeline of just 4 months, I would expect 90% of customers not migrating in time. The percent of those who migrated to the new API after that depends on how vital this service is to them, it would be interesting to see the rate of lost businesses. I know that if a service provider did this to me, I would prefer migrating to their competition, all things being equal.

These are great suggestions.

I'll write about it the next time I'm in a similar situation.

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