Hi @Moahmed_ELnahas,
The token that you have to put there is the one from the receiver device. Then you only have to call the same endpoint from different devices.
Do you know that there is another way to send data between devices of the same account? it is even easier and much efficient… try using thing.call_device(); you can find information about that here https://community.thinger.io/t/communicating-two-esp8266-with-thinger-io-device-call-endpoint/141/6
best