I am trying to build an API POST call using HTTPCaller for situations where there will be a dynamic number of parameters using the same name based on an aggregated list.

In this instance, I have an attribute value called "fee id" which could have anywhere from 1-20+ items in the list (built using Aggregator) depending on how many charges were processed in a specific transaction. Each item on the list needs to be its own parameter (the values cannot be comma-separated), which is where I'm running into trouble. I can configure HTTPCaller manually to handle this, but that is only in my tests where I know ahead of time how many items will need to be processed.

I have been unable to find a way for FME/HTTPCaller to accommodate dynamically generating a query string parameter for each item in the list. Is this possible?

Even though it is not the most elegant solution, I also tried playing around with using a conditional statement for the name column (i.e., if a value in "fee_id(1)" exists...), but a) that doesn't seem to allow omitting the value line completely if the condition is not met, and b) I get the error Could not load module 'C:\\Program Files\\FME\\plugins/_func.dll' : 'The specified module could not be found' when attempting to run HTTPCaller when a condition is added.