Thanks Richard and Angela. That is helpful but hasn't solved my problem yet.

Thanks for that answer. It's helpful to know, but what a terrible solution from NetSuite's API. It basically makes the product item creation part of the REST API useless for people who don't need SuiteTax. I have to say, I've created and used many, many APIs, and I've never struggled so much with one as much as NetSuite's.

Thanks for your help Nicole. That did it! Really appreciate it.

Just circling back on this with an update. I eventually got it to work with C#'s built in RestClient with code modified from the example here: The original issue never was resolved and NetSuite support tried to help, but apparently, helpful logs don't exist. I'm convinced that the logic for checking authorization is…

Thanks Richard. I will contact NetSuite Customer Support. I appreciate the help.

Thanks Richard. I'm not sure what this means: Add empty parameters to the signature must be unchecked I have checked the keys, tokens, etc, and I may be missing something, but presumably, if those were wrong, all of the searches would fail, not just the ones with filtering?

I didn't know about the REST web services log. That's good to know about. There is a link for me to view the requests, but they are always zero byte files with nothing in them. The response is a valid file. However, because I'm getting the 401 unauthorized, the requests don't make it into this log anyway. The error…