code: func (p *DigitalOceanProvider) ApplyChanges(changes *plan.Changes) error {
  	combinedChanges := make([]*DigitalOceanChange, 0, len(changes.Create)+len(changes.UpdateNew)+len(changes.Delete))
  
  	combinedChanges = append(combinedChanges, newDigitalOceanChanges(DigitalOceanCreate, changes.Create)...)
  	combinedChanges = append(combinedChanges, newDigitalOceanChanges(DigitalOceanUpdate, changes.UpdateNew)...)
  	combinedChanges = append(combinedChanges, newDigitalOceanChanges(DigitalOceanDelete, changes.Delete)...)
  
  	return p.submitChanges(combinedChanges)
  }
docs: // ApplyChanges applies a given set of changes in a given zone.