code: func (c *MarketplaceMetering) ResolveCustomer(input *ResolveCustomerInput) (*ResolveCustomerOutput, error) {
  	req, out := c.ResolveCustomerRequest(input)
  	return out, req.Send()
  }
docs: // ResolveCustomer API operation for AWSMarketplace Metering.
  //
  // ResolveCustomer is called by a SaaS application during the registration process.
  // When a buyer visits your website during the registration process, the buyer
  // submits a registration token through their browser. The registration token
  // is resolved through this API to obtain a CustomerIdentifier and product code.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for AWSMarketplace Metering's
  // API operation ResolveCustomer for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidTokenException "InvalidTokenException"
  //   Registration token is invalid.
  //
  //   * ErrCodeExpiredTokenException "ExpiredTokenException"
  //   The submitted registration token has expired. This can happen if the buyer's
  //   browser takes too long to redirect to your page, the buyer has resubmitted
  //   the registration token, or your application has held on to the registration
  //   token for too long. Your SaaS registration website should redeem this token
  //   as soon as it is submitted by the buyer's browser.
  //
  //   * ErrCodeThrottlingException "ThrottlingException"
  //   The calls to the API are throttled.
  //
  //   * ErrCodeInternalServiceErrorException "InternalServiceErrorException"
  //   An internal error has occurred. Retry your request. If the problem persists,
  //   post a message with details on the AWS forums.
  //
  //   * ErrCodeDisabledApiException "DisabledApiException"
  //   The API is disabled in the Region.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/meteringmarketplace-2016-01-14/ResolveCustomer