How to access custom client fields via API?

[apex]

I am trying to figure out how to access and change custom client fields via a module using the API.

 

I know these are available in email templates via smarty like this:

 

{$client_custom_field_fieldname}

or

{$client_custom_fields.2}

 

The API documentation doesn't mention custom fields on the "Update Client" page, but the "Add Client" page says:

 

 

customfields - a base64 encoded serialized array of custom field values

 

 

I've been trying things like this:

 

$postfields["client_custom_field_fieldname"] = "test2";

$postfields["clientsdetails"]["fieldname"] = "test3";

 

I can edit other client properties just fine, and yes I am already editing the custom client fields via SQL but it is a lot of extra code and it's ugly and buggy.

 

So, does anyone know how to do it or if they are even available via the updateclient action?

[apex]

I think I've gotten a bit closer as I found this code mentioned in the forum:

 

 

$postfields["customfields1"] = base64_encode(serialize(array("1"=>"Google")));

 

 

However, I have tried dozens of different things with the above line and still have not been able to change the value of my existing custom client field.

[apex]

$postfields["customfields"] = base64_encode(serialize(array("1"=>"zzz","5"=>"xxxx")));

 

 

^-- That is it. Thanks Matt!