What is the “Correlation ID” field in the API used for?
SOAP API response
Example of a Correlation ID returned in a SOAP API response:
<DoExpressCheckoutPaymentResponseType xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<Timestamp xmlns="urn:ebay:apis:eBLBaseComponents">2008-09-05T20:35:30Z</Timestamp>
<Ack xmlns="urn:ebay:apis:eBLBaseComponents">Success</Ack>
<CorrelationID xmlns="urn:ebay:apis:eBLBaseComponents">d02ac567bfe18</CorrelationID>
<Version xmlns="urn:ebay:apis:eBLBaseComponents">53</Version>
<Build xmlns="urn:ebay:apis:eBLBaseComponents">676720</Build>
NVP API response
Example of a Correlation ID returned in an NVP (Name-Value Pair) API response:
TIMESTAMP=2008-09-05T00:22:56Z&CORRELATIONID=23f585945be2f&ACK=Success&VERSION=53&BUILD=67133