Add more pre-checkers, docstrings

- add SpwCardNotFound error to `send_transaction()`
- Add balance checker to `send_transactions()`
- Made working docstrings
- Correction errors in Parameters

pyspw/errors.py

@@ -35,6 +35,11 @@ class SpwInsufficientFunds(SpwApiError):
         super().__init__("Insufficient funds on the card")
 
 
+class SpwCardNotFound(SpwApiError):
+    def __init__(self):
+        super().__init__("Receiver card not found")
+
+
 class MojangApiError(_ApiError):
     pass
 
@@ -51,3 +56,23 @@ class MojangAccountNotFound(MojangApiError):
 
 class SurgeplayApiError(_ApiError):
     pass
+
+
+class LengthError(ValueError):
+    def __init__(self, max_length: int):
+        super().__init__(f"length must be <= {max_length}.")
+
+
+class BigAmountError(ValueError):
+    def __init__(self):
+        super().__init__(f"amount must be <= 1728.")
+
+
+class IsNotURLError(ValueError):
+    def __init__(self):
+        super().__init__(f"is not url.")
+
+
+class IsNotCardError(ValueError):
+    def __init__(self, card: str):
+        super().__init__(f"Receiver card (`{card}`) number not valid")