400 Response from promise on `app.charge(...)` and `app.payout(...)`

[codehakase]

Hello Team!

The SDK throws a Request failed with status code 400 (from all possible ways of catching the error, that message is still returnedThis error is thrown sometimes on theapp.charge(...)andapp.payout(...)` methods.

Here's a snippet of how I'm calling each methods:

const handler = async () => {
 try { // parent
  ...
  let dapp;
  try {
   dapp = await MobiusClient.AppBuilder.build(keypair, userPublicKey);
  } catch (err) {
   if (err) {
    throw new Error(err.message);
   }
  }
  // process payout
  try {
   await dapp.payout(amount); // or await dapp.charge(amount)...
   console.log(`New payout of ${amount} made to ${userPublicKey}`);
  } catch (err) {
   if (err) throw new Error(`could not make payout to user: ${err.message}`);
  }
 }
 catch (err) {
  if (err) {
   // custom error handling here
  }
 }
}

[codehakase]

cc @lysyi3m

[mrtpain]

In dapp = await MobiusClient.AppBuilder.build(keypair, userPublicKey); , keypair is supposed to be the dev secret seed not the full keypair. I can't see that variable being assigned to that but could be your problem.

[nebolsin]

@codehakase can you please share the appPublicKey, userPublicKey and amount which end up with this failure? Your code looks pretty standard, so I'd guess this error has something to do with actual accounts setup on the network.

[codehakase]

@mrtpain keypair is actually the dev secret key, I abstracted the assignment.

[codehakase]

@nebolsin the error exists on different wallets (dapp store instances), here's one we used more for testing on public net:

userPublicKey: GAC5JPULSLGW3Y2IVFFAAVH2V2KRDWZCVGRXLRS53HQUJYPTYDKA5ADM
appPublicKey: GC7KGS7MJ3EFYLAG4UQFPAW3CDBHQNEP55FJJWMBZVU2F3LR6AI5W4E5
amount: different payouts were expected to complete but failed: 200, 20, 5, 10, 1 MOBI

[codehakase]

The 400 error is thrown at this point:

...
// process payout
  try {
   await dapp.payout(amount); // or await dapp.charge(amount)...
   console.log(`New payout of ${amount} made to ${userPublicKey}`);
  } catch (err) {
   // error is thrown here: `could not make payout to user: Request failed with status code 400`
   if (err) throw new Error(`could not make payout to user: ${err.message}`); 
  }

[nebolsin]

@codehakase If you experience this on pubnet, another thing to check is that you correctly configured the SDK to use the network, using the following code:

const mobius = new Mobius.Client();
mobius.network = StellarSdk.Networks.PUBLIC;

Using StellarSdk.Network.usePublicNetwork() is not enough and will actually result in 400 errors because the app will still use testnet's Horizon server but generate signatures for public network.

[codehakase]

@nebolsin Oh... I see, that may just be the case, will update my code and run some tests

[codehakase]

@nebolsin based on your last reply, just for heads up, here's how I initialise the mobius client in use by each handler:

...
const MobiusClient = require('@mobius-network/mobius-client-js');

// dapp instance is created with
dapp = await MobiusClient.AppBuilder.build(keypair, userPublicKey);

I can't really picture where to explicitly set the network on the mobius instance in this scenario.

[mrtpain]

@codehakase index.js or where you set CORS, you can see the Flappy Dapp example here

[codehakase]

@mrtpain thanks!

[codehakase]

@nebolsin I updated my code to set the network on the client, and on various runs, the same error is thrown from both the charge and payout functions