How the Data-driven matching will happen when Excel or CSV file has more columns than what the request data has in a transaction.
Can Data Driven .xlsx file values be used in VSI response without a field value to match on in the request?
Yes. For example, you have 4 Request data arguments and you have 6 columns in Excel file. The request matching is going to happen on all the Request data arguments and the corresponding 2 columns which were not mapped with Request data but these can be used in your VSI response.
Excel file can have as many columns as it can but all the Request Data Arguments in a transaction need to be mapped to the Excel data. For example, if a transaction has 5 Request Data Arguments then all the arguments need to be mapped to the Excel Data. Mapping 1/2/3/4 will return No Match.