}
public static final PayPalAPIAAInterface getAPIAAInterface(APICredential _credentials) {
String key = _credentials.getKey();
if (!API_AA_INTERFACE_MAP.containsKey(key)) {
PayPalAPIAAInterface api = new NVPAAAPIImpl(_credentials);
API_AA_INTERFACE_MAP.put(key, api);
}
return (PayPalAPIAAInterface) API_AA_INTERFACE_MAP.get(key);
}