return values as strings

bbpay.py

@@ -124,8 +124,8 @@ class Release(BBPay):
         signable = eth_account.messages.encode_defunct(keccak(packed))
         signature = eth_account.account.Account.sign_message(signable, private_key=getenv('PRIVATE_KEY')).signature.hex()
         return {
-            'pixTarget': numeroParticipante,
-            'amount': valorSolicitacao,
+            'pixTarget': str(numeroParticipante),
+            'amount': str(valorSolicitacao),
             'pixTimestamp': pixTimestamp.hex(),
             'signature': signature }