Events can be subscribed to via a REST proxy or HLF SDKs. The following is the procedure to subscribe via a REST proxy:

• REST endpoint: <host name>:<port>/<REST proxy>/bcsgw/rest/v1/event/subscribe
• REST method: POST
• Headers:
  • Content-Type: application/json
  • Authorization: <Basic authorization>
  • Accept-Charset: UTF-8:

• The JSON input to be passed to the REST API:

{
  "requests":[
  {
    "eventType":"chaincodeEvent",
    "callbackURL": "--- call back webhook url---",
    "callbackTlsCerts":{
      "caCert":" -- mandatory field which is the callback server's CA certificate in PEM format. It will be verified by REST proxy",
      "clientCert": "--Optional field which refers to the REST proxy certificate should use during callback --",
      "keyPassword": "--clientCert's encrypted private key in base64 encoded"
    },
    "expires": "1m",
    "channel": "channeleducation",
    "chaincode": "cceducation",
    "eventName": "testEvent"
  }
  ]
}

• It responds with subid.