[error] getting error if trying to print payload

if trying to print payload then its giving error else its working fine, An internal curl error has occurred within the executor! Error Msg: Operation timed out

Please share your code

why payload is not printing ,

and here is custom data or providing payload to appwrite console```{
'hallelujah':[
{
'image': 'image',
'productName': 'love you jesus ',
'productUnit': 'productUnit',
'barcode': 55558888,
'id': " d5454a",
'sellingPrice': 44.0,
'totalQuantity': 100.0,
'quantity': 1.0
}
]

}```

What doesn't this work?

final payload = "I'm a string";
print(payload["key"]);

yes, this does not work some time , its saying "type '_OneByteString' is not a subtype of type 'int' of 'index'" and if execution is delaying then it just says An internal curl error has occurred within the executor! Error Msg: Operation timed out

You'll see that operation timed out if your function throws an exception

You need to send a valid JSON string for the data. Single quotes are not valid in JSON.

Then, you need to use jsonDecode() to convert the JSON string to a map

now its working , thanks @Steven