Shopping API error - IP limit exceeded

I am getting the following error when I make Shopping API calls:
 

<Errors>
  <ShortMessage>IP limit exceeded.</ShortMessage>
  <LongMessage>Applications from this IP address are limited in the number of calls they can make.</LongMessage>
  <ErrorCode>1.21</ErrorCode>
  <SeverityCode>Error</SeverityCode>
  <ErrorClassification>RequestError</ErrorClassification>
</Errors>

How should I resolve this error?

Summary

When you join the developers program and get your keyset, you can make 5,000 Shopping API calls every day:

https://developer.ebay.com/develop/apis/api-call-limits

If you are building a server side application and need more than 5,000 calls a day, you can file a Application Growth Check request to get higher call limits.

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