how to solve web api route defined in webapiconfig.cs file

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WebAPI

i am working on web api project. i am totally new for web api project. i have two controller namely Inventory and Customer. in both controller, a get method with same number of parameter but method name are different. below are controller method details with parameter.
Inventory controller method signature is:

[System.Web.Http.HttpGet]
       [System.Web.Http.ActionName("GetByPara")]
       public IEnumerable<Inventory> GetInventoryByParamas(string IP, string Port, string CompanyName, string UserName, string Password, string Item, string Description, string Price)

{
}

and Customer controller method signature is:

[System.Web.Http.HttpGet]
[System.Web.Http.ActionName("custbyparam")]
       public IEnumerable<Customer> GetCustomerByParams(string IP, string Port, string CompanyName, string UserName, string Password, string CustomerName, string city, string Phone1)

{
}
and i defined the route for both controller in webapiconfig.cs file, and also define the default route, which is below: just see the routes.

public static void Register(HttpConfiguration config)
       {
//default route:
           config.Routes.MapHttpRoute(
               name: "ActionApi",
               routeTemplate: "api/{controller}/{action}/{id}",
               defaults: new { id = RouteParameter.Optional }
           );

//Inventory route

config.Routes.MapHttpRoute(name: "InventoryParams", routeTemplate: "api/{Controller}/{action}/{IP}/{Port}/{CompanyName}/{UserName}/{Password}/{Item}/{Description}/{Price}");

//Customer route

config.Routes.MapHttpRoute(name: "CustomerParams", routeTemplate: "api/{controller}/{action}/{IP}/{Port}/{CompanyName}/{UserName}/{Password}/{CustomerName}/{city}/{Phone1}");

}
i write the Inventory route on top of customer route, and pass the parameter in url:
http://localhost:55024/api/Inventory/GetByPara/192.168.1.131/5555/Spearpointlocal/admin/syspro15StarTX/100-10100-CI/Coin%20Wrappers%20-%20SBA%20Dollar%20and%20Canadian%20Loonies%20-Custom%20Imprint/7[^]

but when i write the Inventory route bottom on customer route it's not working while i pass the same url. i got the error the page cannot be found(HTTP 404 not found).

and vice-versa for customer route and passing the url for customer.


please guys help me,
thanks in advance.
please please help.