Youtube Data API with Kotlin: The request is missing a valid API key - spring

Question

So I'm trying to use the Youtube Data API with Kotlin + Spring Boot and I've been struggling a bit.
For now, I'm using hardcoded values for the api_key and the access_token for test purposes.
I'm trying to send a request to list my playlists but I keep getting this error:
"error": {
"code": 403,
"message": "The request is missing a valid API key.",
"errors": [
{
"message": "The request is missing a valid API key.",
"domain": "global",
"reason": "forbidden"
}
],
"status": "PERMISSION_DENIED"
Here's my code:
Controller:
#RestController
class PlaylistController(
private val youtubeService: YoutubeService
) {
#GetMapping("/playlists")
fun getPlaylists() : YoutubePlaylistResponse {
return youtubeService.getPlaylists()
}
}
Service:
#Service
class YoutubeService(
private val youtubeClient: YoutubeClient
) {
fun getPlaylists() = youtubeClient.getPlaylists(
access_token = "[ACCESS_TOKEN]",
api_key = "[API_KEY]"
)
}
Client
#FeignClient(name = "youtube", url = "https://www.googleapis.com/youtube/v3")
interface YoutubeClient {
#GetMapping("/playlists")
fun getPlaylists(
#RequestHeader("Authorization", required = true) access_token: String,
#RequestParam("api_key") api_key: String,
#RequestParam("part") part: String = "snippet",
#RequestParam("mine") mine: Boolean = true
): YoutubePlaylistResponse
}
Any thoughts on what I'm doing wrong?
PS: I'm getting the acess_token through the OAuth 2.0 Playground
Edit:
I was calling api_key but it's actually only key.
But now I'm getting a new problem:
"error": {
"code": 401,
"message": "The request uses the \u003ccode\u003emine\u003c/code\u003e parameter but is not properly authorized.",
"errors": [
{
"message": "The r... (464 bytes)]] with root cause
Apparently, it's because I'm trying to access my playlists and it says that I don't have the permission, but when I do the same request using cURL I get an appropriate response. Any thoughts on this?

Answer 1

According to the API documentation, the parameter should be called key rather than api_key:
Every request must either specify an API key (with the key parameter) or provide an OAuth 2.0 token. Your API key is available in the Developer Console's API Access pane for your project.
Source: https://developers.google.com/youtube/v3/docs