Error posting a test tweet.
HTTP Code: 402
API Response:
object(stdClass)#2 (4) {
  ["account_id"]=>
  int(1527019086881771520)
  ["title"]=>
  string(15) "CreditsDepleted"
  ["detail"]=>
  string(94) "Your enrolled account [1527019086881771520] does not have any credits to fulfill this request."
  ["type"]=>
  string(42) "https://api.twitter.com/2/problems/credits"
}