code: public AgreementTermsInner getAgreement(String publisherId, String offerId, String planId) {
          return getAgreementWithServiceResponseAsync(publisherId, offerId, planId).toBlocking().single().body();
      }
docs: Get marketplace agreement.
  
  @param publisherId Publisher identifier string of image being deployed.
  @param offerId Offer identifier string of image being deployed.
  @param planId Plan identifier string of image being deployed.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the AgreementTermsInner object if successful.