Trouble connecting to API - wcf

Question

I am new to WCF/APIs and know little to nothing about security. Let me know if I need to provide any more information.
I am trying to connect to a service using
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="BasicHttpBinding_ISalesOrderService">
<security mode="Transport" >
<transport clientCredentialType="Basic"></transport>
</security>
</binding>
<binding name="BasicHttpBinding_IDocumentationService">
<security mode="TransportCredentialOnly" >
<transport clientCredentialType="Basic"></transport>
</security>
</binding>
</basicHttpBinding>
</bindings>
<client>
<endpoint address="address1"
name="BasicHttpBinding_ISalesOrderService"
binding="basicHttpBinding"
bindingConfiguration="BasicHttpBinding_ISalesOrderService"
contract="SoCalls.ISalesOrderService" />
<endpoint address="address2"
binding="basicHttpBinding"
bindingConfiguration="BasicHttpBinding_IDocumentationService"
contract="DocCalls.IDocumentationService"
name="BasicHttpBinding_IDocumentationService" />
</client>
</system.serviceModel>
With this, I get this error:
'System.ServiceModel.Security.MessageSecurityException'
The HTTP request is unauthorized with client authentication scheme 'Basic'.
The authentication header received from the server was 'Basic Realm'.
Edit
I followed the instructions suggested in the link provided in the comments, still is giving me this error. I updated my code but I think I am still a bit confused on whether to use HTTP/HTTPS due to lack of knowledge of either service.
Here is how I instantiate my service:
private static SoCalls.SalesOrderServiceClient CreateSalesOrderServiceClient()
{
BasicHttpBinding myBinding = new BasicHttpBinding();
myBinding.MaxReceivedMessageSize = 10000 * 2;
myBinding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
myBinding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;
EndpointAddress ea = new EndpointAddress("address1");
SoCalls.SalesOrderServiceClient client = new SoCalls.SalesOrderServiceClient();
client.ClientCredentials.UserName.UserName = ("username");
client.ClientCredentials.UserName.Password = ("password");
return client;
}

Answer 1

As it seems, I did not have access to the API with this specific database which is what was giving me my error. I tried sending other credentials for a separate database from the same server and it worked perfectly fine. Purchased the license required and the code works as expected.