Kinesis Stream - API Gateway: Serialization Exception - aws-api-gateway

Question

I am integrating Kinesis Stream with API Gateway following this tutorial.
The records endpoint uses the PutRecords action. The expected request template for this endpoint is the following:
{
"StreamName": "$input.params('stream-name')",
"Records": [
{
"Data": "$util.base64Encode($elem.data)",
"PartitionKey": "$input.path('$.PartitionKey')"
}#if($foreach.hasNext),#end
]
}
Despite following the tutorial exactly as it is, if I send a Request body with the expected format such as the next one, I get a SerializationException error:
{
"StreamName": "my_kinesis_stream",
"Records": [
{
"Data": "XzxkYXRhPl8x",
"PartitionKey": "partitionKey1"
},
{
"Data": "f1PxFQo92Afh",
"PartitionKey": "partitionKey1"
},
{
"Data": "Gi4sEdd08HypA",
"PartitionKey": "partitionKey1"
}
]
}
I don't know if the template of the tutorial is the right one or if my body request has not the proper format.
Oddly, all the other endpoints of the tutorial work just fine. This is the only one not working properly.
Thanks in advance.

Answer 1

The documentation actually was wrong. This documentation specifies the correct request template:
{
"StreamName": "$input.params('stream-name')",
"Records": [
#foreach($elem in $input.path('$.records'))
{
"Data": "$util.base64Encode($elem.data)",
"PartitionKey": "$elem.partition-key"
}#if($foreach.hasNext),#end
#end
]
}