refactoring some op functions, chain populating, type corrections

api/axios.ts

@@ -1,4 +1,5 @@
 // TODO: rate limit module is busted (CJS types), do something for rate limiting
+// bottleneck (https://npmjs.com/package/bottleneck) looks nice
 import axios, { type AxiosInstance } from "axios";
 import { baseAPIURL, accountsAPIURL } from "../constants.ts";
 import logger from "../utils/logger.ts";

api/spotify.ts

@@ -78,7 +78,7 @@ const singleRequest = async <RespDataType>({
     if (error.response) {
       // Non 2XX response received
       message = message.concat(
-        `${error.response.status} - ${error.response.data?.message}`
+        `${error.response.status} - ${error.response.data?.error?.message}`
       );
       res?.status(error.response.status).send(error.response.data);
       logger.warn(message, {