The installation of Sitecore comerce 9 can show a tons of error, here you can find a list of some issues that I faced;
1)The error below happens when you are tring to install on SQL SERVER 2017
—– DeployCommerceDatabase : DeployCommerceDatabase ———————— Deleting existing CommerceServices databases… Install-SitecoreConfiguration : SQL Server Provider for Windows PowerShell is not installed. At F:\SITECORE_ECommerce_9\SIF.Sitecore.Commerce.1.0.1748\MyDeploy-Sitecore-Commerce.ps1:74 char:2 + Install-SitecoreConfiguration @params + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Install-SitecoreConfiguration
Solution :
Download the file below only if you have “SQL SERVER 2017”
Overwrite this file on the installation SIF.Sitecore.Commerce.1.0.1748\Modules\DeployCommerceDatabase\DeployCommerceDatabase.psm1 Run the script to Install again and the issue will not show up
2) BootstrapCommerceServices : BootStrapCommerceServices
Boostrap Commerce services : http://localhost:5005/ecommerce/BootStrap()
HTTP ERROR 502.3 – Bad Gateway
The Specified CGI Application encountered an error and the server terminated the process
Resolution :
Open “turn windows features on or off”
Check :
Internet Information services -> Web Management Tools -> IIS 6 Management Compatibility
->IIS 6 Management Console
->IIS 6 Scripting Tools
->IIS WMI Compatibility
->IIS Metabase and IIS 6 configuration compatibility
3)Configuring the Powershell Script
1)Where is the MergeToolFullPath ?
Probably you have on your own computer, check for the path below
MergeToolFullPath = Resolve-Path -Path “C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\Web\Microsoft.Web.XmlTransform.dll”
4)Fails to Start
The error below, it shows when you try to Preview the Commerce websites, and there is an error
Probable Cause : The SQL server is not properly configured on the scripts, your instance like “.\SQLSERVER” must be configured
Check this article, this shows you which files you should configure
Sitecore Tips 
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