def confirm_billing_agreement(
      amazon_billing_agreement_id,
      merchant_id: @merchant_id,
      mws_auth_token: nil
    )

      parameters = {
        'Action' => 'ConfirmBillingAgreement',
        'SellerId' => merchant_id,
        'AmazonBillingAgreementId' => amazon_billing_agreement_id
      }

      optional = {
        'MWSAuthToken' => mws_auth_token
      }

      operation(parameters, optional)
    end
def confirm_billing_agreement(
      amazon_billing_agreement_id,
      merchant_id: @merchant_id,
      mws_auth_token: nil
    )

      parameters = {
        'Action' => 'ConfirmBillingAgreement',
        'SellerId' => merchant_id,
        'AmazonBillingAgreementId' => amazon_billing_agreement_id
      }

      optional = {
        'MWSAuthToken' => mws_auth_token
      }

      operation(parameters, optional)
    end
Confirms that the billing agreement is free of constraints and all
 required information has been set on the billing agreement
 @see https://pay.amazon.com/documentation/apireference/201751630#201751710
 @param amazon_billing_agreement_id [String]
 @optional merchant_id [String]
 @optional mws_auth_token [String]