If you have implemented redirect-based payment and notice that data is not being sent back to the redirect URL, check the following:

• Your merchant site must send the variablevads_return_mode. If this variable is not sent, no data will be returned on the response page.
• You receive the data in the correct format (GET ou POST), this value was selected by the integrator via the variablevads_return_mode.
• There is a redirect on the callback URL you provided. Data may be lost during this redirect.
• If the payment page displays an integration-related error, the data will not be returned.