Feature request: Add API message when error

[dcaud]

It would be nice to have a more informative error message in the search_ebay function.

This already gives a generic error:

    if (httr::http_error(resp)) {
      stop(sprintf("ebay API request failed [%s]", httr::status_code(resp)), 
           call. = FALSE)
    }

Adding something like the below around line 345 might might be helpful to parse the error message:

    if (httr::http_error(resp)) {
      parsed.error <- jsonlite::fromJSON(httr::content(resp, "text"), 
                                   simplifyVector = FALSE)
      parsed.error[["errorMessage"]][[1]][["error"]][[1]][["message"]][[1]]
      stop(sprintf("ebay API request failed [%s]", httr::status_code(resp)), 
           call. = FALSE)
    }

[gsimchoni]

Closing as it seems ebay is shutting down its open API: https://ebaydts.com/eBayKBDetails?KBid=5102