I am connected to chirpstack web panel which I host it at aws using docker.
Now i need to know from where I can use api?
I created API Key under Tenant > Api Keys.
Do I need to do any other installation?
If Chirpstack is working the API is working, no extra installs necessary. The endpoint is the same DNS as your web UI, including port. The API protocol documentation can be found here: Protocol documentation - ChirpStack open-source LoRaWAN® Network Server documentation.
I don’t know much about PHP but I use python for the gRPC API, here are some examples I’ve given to others: Creating Channel and Retrieving Metrics, Activating a device, Retrieving Keys.