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In PRODUCTION mode, if your Buyer gets an error message such as:

An error occurred during the payment request. The form is sent empty.

It becomes impossible to make the payment and the transaction is definitively lost.

You will receive an e-mail notification containing the form that the gateway was unable to process and the value of the invalid field.

We invite you to check the following reason(s) to resolve the issue:

The signature field is absent or empty.

The empty_params error appears when the signature field is absent or empty. It does not mention a problem of signature computation.

Check that the signature field is present in your form.

Check that the signature field is spelled correctly (all lowercase).

Make sure the field value is not empty.