It is a service account credential (or other).
array(3) {
  ["access_token"]=>
  string(1024) "ya29.c.c0AZ4bNpYndYvoHac0xAacOokf8vL_Pg1cxzSCVI06jSFWdGB3OeB_qERRnodBktj7x4EuE1qGO_j0dB2HeghZIPgQnmxBnwiZd-EOZgOIRYhfCT5wJ-voM5ePvh0Fa3V_UMkrKyKgW833VLsDLuON5oMW-uAbJ4sdP7WrY9NA3_AypNKCaCrr9yEuOa8h70TqvaYgLMUvR57Ee8KMOw_vGV-GEjODj6KQ4NSkHHRxPirxSxRpHw8O9Tcu3NwCoHRUTnZh0BdPP7xp3pdxHdh-c_ykv0Obw7zWYT7f4Y6V9Y69bfZ1Icg0RKCt9JN-EFa8HrlgLyes9032ivxZxti9glZ7jb9iVMxu0PQN9pB_RgxjBvw0p43zY9AN384AMchq0y0akdlIt5Sf3mg83uq6kZgj971e03uWugBl6It-84dj07oBk_qy0JYBi-753j3WrZ5wewcfJByvrj2s-z0YhJdfMQVy3n9wk2di48msXYc4yQldMpjItXnOrhRi-mImWzzidylpS6MhlqsyurokOlbjRxmp49yI64rc2bsQZpjdt1ao6a72MiWs9JJQfcxorOmzpaBYSzFIe-X7orry-fxql59O28Sw3iwQMt8g5Bz8XWvM-zhcs-g2kdfhRQVgvon-dhY7nSR1ySbo8YRv8-0iby3sBJZO-RiJFarOaU7mdOS0Fuw70g2Vhpg81pZmIkrd-5Oi2kxp7dU3y_JXsw-tV6iftOFQM3plh_onfvja8xFvYnu-if84OsZg_62rad_XSvZ9R-Welat5utjge34XgYcs6UFRtr9WoRopyvYipeVp_148vuk8wcB-Mu9XXuuI9JWiMatr1ia6p5eR3zs7Iu25_7c4bd9OjuspttfuShySXk0o9dOrrg9iWQnsozUoipq3RWu5o_au89o8amF4RZcIUOBblYU8_0_ot23jpIWO_YjMZkb-S5mz0hUiBaeUma7OtQ75WoRuZjQIbSmqvZta7uor1f_XdUsRBqs21OQukY321pF"
  ["expires_in"]=>
  int(3599)
  ["token_type"]=>
  string(6) "Bearer"
}