Defaults Section
The Defaults section is a dictionary containing default values to be used for given source fields.
If a field is blank/empty, the value for the corresponding key will be inserted.
If a field does not exist in the source data, the field is created using the corresponding Defaults value.
The Defaults section is optional.
Examples
"Defaults": {
"Country": "Canada",
"Province": "ON",
"Carrier": "Canada Post",
"Total": 0.00
}