code: async function spend (amount, recipientId, options = {}) {
    const opt = R.merge(this.Ae.defaults, options)
    const spendTx = await this.spendTx(R.merge(opt, { senderId: await this.address(), recipientId, amount: amount }))
    return this.send(spendTx, opt)
  }
docs: Send tokens to another account
  @instance
  @category async
  @rtype (amount: Number|String, recipientId: String, options?: Object) => Promise[String]
  @param {Number|String} amount - Amount to spend
  @param {String} recipientId - Address of recipient account
  @param {Object} options - Options
  @return {String|String} Transaction or transaction hash