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Update api_principles.md #49

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2 changes: 2 additions & 0 deletions docs/api_principles.md
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Expand Up @@ -171,6 +171,8 @@ GET /v10/refunds/{refundId}
GET /v10/pointofsales/{posId}/checkin
````

The `pollDelayInMs` field must be used when present in the response body. This insures optimal polling, reducing time to completion of payment flows.

If a response includes a `pollDelayInMs` of 1000, the client **must** wait at least 1000ms (i.e. 1 second)
before polling the same endpoint. In case no response is received when querying one of the above polling endpoints,
then clients should either:
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