diff --git a/payme/exceptions/general.py b/payme/exceptions/general.py
index 9e6ebae..9825245 100644
--- a/payme/exceptions/general.py
+++ b/payme/exceptions/general.py
@@ -237,6 +237,12 @@ def __init__(self, message="No receipts found for the given transaction ID.", da
         super().__init__(message, data)
 
 
+class UnknownPartnerError(BaseException):
+    """The given partner ID is unknown."""
+    def __init__(self, message="Unknown partner or ID and Key not active", data=None):
+        super().__init__(message, data)
+
+
 errors_map = {
     -32300: TransportError,
     -32700: ParseError,
@@ -255,5 +261,6 @@ def __init__(self, message="No receipts found for the given transaction ID.", da
     -31102: OtpAttemptsExceededError,
     -31103: OtpInvalidCodeError,
     -31602: ReceiptsNotFoundError,
-    -32500: InvalidTokenFormat
+    -32500: InvalidTokenFormat,
+    -31601: UnknownPartnerError,
 }
diff --git a/payme/types/response/receipts.py b/payme/types/response/receipts.py
index 6fe5014..757c862 100644
--- a/payme/types/response/receipts.py
+++ b/payme/types/response/receipts.py
@@ -123,7 +123,6 @@ class Receipt(Common):
     type: int
     external: bool
     operation: int
-    category: any = None
     error: any = None
     description: str = None
     detail: Detail = None