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Every error thrown by the Mobile Deposit SDK is a DepositError instance with a machine-readable code property. The error class is the same as the web SDK, but the mobile SDK has additional error codes for browser and deep link failures.

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DepositError

import { DepositError, getDisplayMessage } from '@swype-org/deposit-mobile';

class DepositError extends Error {
  readonly code: DepositMobileErrorCode;
  constructor(code: DepositMobileErrorCode, message: string);
}

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Error codes

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Mobile-specific codes

CodeMeaningUser-facing message
BROWSER_FAILEDFailed to open the in-app browser (e.g. openUrl threw an error).”Unable to open the payment browser. Please try again.”
BROWSER_DISMISSEDUser dismissed the in-app browser before completing the payment.”The payment browser was closed before the transfer completed.”
DEEP_LINK_INVALIDThe callback deep link was malformed or missing required parameters.”The payment callback was malformed. Please try again.”

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Shared codes (same as web SDK)

CodeMeaningUser-facing message
SIGNER_REQUEST_FAILEDSigner returned a non-2xx response.”Unable to start the payment. Please try again.”
SIGNER_NETWORK_ERRORNetwork failure reaching the signer.”Unable to reach the payment server. Check your connection and try again.”
SIGNER_RESPONSE_INVALIDSigner response missing required fields (merchantId, payload, signature, preview).”The payment server returned an unexpected response.”
SIGNER_TIMEOUTSigner did not respond within signerTimeoutMs.”The payment server took too long to respond. Please try again.”
FLOW_TIMEOUTEntire flow exceeded flowTimeoutMs.”The payment flow timed out. Please try again.”
INVALID_REQUESTBad input (missing amount, invalid address, destroyed instance, etc.).”Invalid payment request. Please check your input.”

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getDisplayMessage

Returns a user-friendly display string for a DepositError. You can show this directly in your UI. 
function getDisplayMessage(error: DepositError): string

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Usage

import { DepositError, getDisplayMessage } from '@swype-org/deposit-mobile';

try {
  await deposit.requestDeposit({ /* ... */ });
} catch (err) {
  if (err instanceof DepositError) {
    Alert.alert('Payment Error', getDisplayMessage(err));
    console.error(err.code, err.message);
  }
}

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Handling specific error codes

try {
  await deposit.requestDeposit({ /* ... */ });
} catch (err) {
  if (!(err instanceof DepositError)) throw err;

  switch (err.code) {
    case 'BROWSER_DISMISSED':
      // User intentionally closed — no action needed
      break;
    case 'BROWSER_FAILED':
      // Could not open browser — prompt retry or show fallback
      showRetryDialog(getDisplayMessage(err));
      break;
    case 'DEEP_LINK_INVALID':
      // Malformed callback — log for investigation
      reportError(err);
      break;
    case 'SIGNER_REQUEST_FAILED':
    case 'SIGNER_NETWORK_ERROR':
    case 'SIGNER_TIMEOUT':
      // Signer issue — prompt retry
      showRetryDialog(getDisplayMessage(err));
      break;
    case 'SIGNER_RESPONSE_INVALID':
      // Integration bug — log for investigation
      reportError(err);
      break;
    case 'FLOW_TIMEOUT':
      showRetryDialog(getDisplayMessage(err));
      break;
    case 'INVALID_REQUEST':
      showValidationError(getDisplayMessage(err));
      break;
  }
}

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DepositMobileErrorCode

The union of all mobile error code strings: 
type DepositMobileErrorCode =
  | 'BROWSER_FAILED'
  | 'BROWSER_DISMISSED'
  | 'DEEP_LINK_INVALID'
  | 'SIGNER_REQUEST_FAILED'
  | 'SIGNER_NETWORK_ERROR'
  | 'SIGNER_RESPONSE_INVALID'
  | 'SIGNER_TIMEOUT'
  | 'FLOW_TIMEOUT'
  | 'INVALID_REQUEST';