code: function subscribeToContractEvent(payload) {
    const {
      props,
      method,
      contractInstance,
    } = payload
  
    const {
      options,
      callback,
    } = props
  
    return subscribe(contractInstance[method], options, callback)
  }
docs: @function subscribeToContractEvent
  
  @description Subscribes to specific contract event
  
  @param {object} payload - Payload object
  @param {object} payload.props - API function properties
  @param {object} [payload.props.options] - Event options (@see subscribe)
  @param {eventCallback} [payload.props.callback] - Event callback (@see subscribe)
  @param {object} payload.contractInstance - Contract instance
  @param {string} payload.method - Event name
  
  @returns {object} The event emitter (@see subscribe)