iOS-MPN-ModifySubscription.m

for (LSMPNSubscription *mpnSubscription in _client.MPNSubscriptions) {
    if ([_item isEqualToString:mpnSubscription.itemGroup]) {

        // Subscription found, copy it and add a trigger expression
        LSMPNSubscription *copy= [[LSMPNSubscription alloc] initWithMPNSubscription:mpnSubscription];
        copy.triggerExpression= @"Double.parseDouble(${last_price}) > 100.0";
        
        // Modify the subscription on the Server
        [_client subscribeMPN:copy coalescing:NO]; // When modifying the coalescing flag is ignored
        break;
    }
}