How To Retrive the Sample payload structure(JSON/XML) from already developed integration.The data not present in inline .

How can we retrieve/Download/fetch the sample payloadformat file(Eg:Json/XML) uploaded in the rest configuration request and response .
Need that file to change the Sequence of the attributes in the mapping to make the child attribute to the Parent attribute as the thirdparty system excepts the output xml /json sequence to be in the modified manner.How can the attribute changes can be done in mapping Eg:ItemMaster—item–itemGid—Transaction code was earlier sequence .Now needed to update the sequence flow as Itemmaster–Item–Transactioncode.So as the mapping file target attribute sequence need to be changed.Can you please suggest on this how it can be done.

The data structure not present in the inline/or at final schema page