rejectSettlementAgreement (externalId: string, user: User): Promise<Claim> {
    const options = {
      method: 'POST',
      uri: `${claimStoreApiUrl}/${externalId}/settlement-agreement/reject`,
      body: '',
      headers: {
        Authorization: `Bearer ${user.bearerToken}`
      }
    }

    return request(options).then(function (response) {
      return response
    })
  }

  static countersignOffer (externalId: string, user: User): Promise<Claim> {
    const options = {
      method: 'POST',
      uri: `${claimStoreApiUrl}/${externalId}/offers/defendant/countersign`,
      body: '',
      headers: {
        Authorization: `Bearer ${user.bearerToken}`
      }
    }

    return request(options).then(function (response) {
      return response
    })
  }

  static makeOffer (externalId: string, user: User, offerForm: OfferForm): Promise<Claim> {
    const offer: Offer = OfferModelConverter.convert(offerForm)

    const options = {
      method: 'POST',
      uri: `${claimStoreApiUrl}/${externalId}/offers/defendant`,
      body: offer,
      headers: {
        Authorization: `Bearer ${user.bearerToken}`
      }
    }

    return request(options).then(function (response) {
      return response
    })
  }

  private static async getRangeGroup (eventType: string, channel: string): Promise<FeeRange[]> {
    if (StringUtils.isBlank(eventType)) {
      throw new Error('Fee eventType is required')
    }
    if (StringUtils.isBlank(channel)) {
      throw new Error('Fee channel is required')
    }
    const uri: string = `${feesUrl}/fees-register/fees?service=${service}&jurisdiction1=${jurisdiction1}&jurisdiction2=${jurisdiction2}&channel=${channel}&event=${eventType}&feeVersionStatus=approved`
    const options = {
      uri: uri
    }
    return request(options).then(function (response) {
      return plainToClass(FeeRange, response as object[])
    })

  }

 /**
  * Calculates the fee based on fee event and amount
  *
  * @param eventType which fee event to use
  * @param amount amount in GBP
  * @param channel online or paper/default
  * @returns {Promise.<FeeOutcome>} promise containing the Fee outcome (including fee amount in GBP)
  */
 static async calculateFee (eventType: string, amount: number, channel: string): Promise<FeeOutcome> {
   if (StringUtils.isBlank(eventType)) {
     throw new Error('Fee eventType is required')
   }
   if (StringUtils.isBlank(channel)) {
     throw new Error('Fee channel is required')
   }
   ClaimValidator.claimAmount(amount)
   const feeUri: string = `${feesUrl}/fees-register/fees/lookup?service=${service}&jurisdiction1=${jurisdiction1}&jurisdiction2=${jurisdiction2}&channel=${channel}&event=${eventType}&amount_or_volume=${amount}`
   const options = {
     uri: feeUri
   }
   return request(options).then(function (response) {
     return plainToClass(FeeOutcome, response as object)
   })
 }

  async retrieve (user: User, paymentReference: string): Promise<PaymentRetrieveResponse | undefined> {
    checkDefined(user, 'User is required')
    checkNotEmpty(paymentReference, 'Payment reference is required')

    const options = {
      uri: `${baseURL}/${paymentReference}`,
      headers: {
        Authorization: `Bearer ${user.bearerToken}`,
        ServiceAuthorization: `Bearer ${this.serviceAuthToken.bearerToken}`
      }
    }

    return request(options).then(function (response) {
      return plainToClass(PaymentRetrieveResponse, response)
    }).catch(function (err) {
      if (err.statusCode === HttpStatus.NOT_FOUND) {
        return undefined
      }
      throw err
    })
  }

  async create (user: User, externalId: string, fees: Fee[], returnURL: string): Promise<Payment> {
    checkDefined(user, 'User is required')
    checkNotEmpty(externalId, 'ExternalId is required')
    checkNotEmpty(fees, 'Fees array is required')
    checkNotEmpty(returnURL, 'Post payment redirect URL is required')

    const options = {
      method: 'POST',
      uri: baseURL,
      body: this.preparePaymentRequest(externalId, fees),
      headers: {
        Authorization: `Bearer ${user.bearerToken}`,
        ServiceAuthorization: `Bearer ${this.serviceAuthToken.bearerToken}`,
        'return-url': `${returnURL}`
      }
    }

    return request(options).then(function (response) {
      return Payment.deserialize(response)
    })
  }