You are in the wrong place on the web. You want this Other Forum: Intuit Developers Forum

Resolution for 'Business Validation issue: 'GET request sent by postman to sandbox gets response “Business Validation Error 6000 Unexpected critical company access error -20000” but works when sent by API explorer.' available: Yes.

The Business Validation issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the Business Validation issue yourself by looking for a resolution described in the article. If it is a complex Business Validation issue or you are unable to solve the issue, you may contact us by clicking here or by using other Business Validation support options.

For more information about resolving issues related to Business Validation in Quickbooks/QBO or to get support for the issue 'GET request sent by postman to sandbox gets response “Business Validation Error 6000 Unexpected critical company access error -20000” but works when sent by API explorer.', click the link below: