access_token=273347866145980|gIdxLQBHt…
– that’s not the token, only the second part is – so you have to split this string at the =
character, and only use the second half as the actual token.
But the combination app_id|app_secret
, pipe symbol in the middle always works as app access token, so there is no real need to request a token with an API call before. And this is also the token the PHP SDK builds and automatically uses itself when no user access token is available.