Links

Update Multiple Datastreams Simultaneously

Update multiple Datastreams of a single device with one GET request. It can help with saving the data volume for cellular devices.
Batch update is required for Map Widget in Blynk.Console because all datapoints should be synced to one timestamp and same coordinates
get
https://{server_address}
/external/api/batch/update?token={token}&{pin1}={value1}&{pin2}={value2}
Batch update
You can also use Blynk.Edgent API to send data with the same timestamp.