When performing a visit, a predefined amount may be added to the vehicle load if it's a pickup, or subtracted if it's a delivery. This message defines such amount. See loadDemands.

JSON representation
  "amount": string

string (int64 format)

The amount by which the load of the vehicle performing the corresponding visit will vary. Since it is an integer, users are advised to choose an appropriate unit to avoid loss of precision. Must be ≥ 0.