Fix a NUSAOP API endpoint

We need to adapt a NUSOAP endpoint to accept evolution of our customer request. The endpoint is build in PHP and une NUSOAP librairies. We do not need modify the answers but "just" the structure of accepted request. Look at attached file. For the moment the endpoint accept SOAP request like slide 1 and for now we need to accept request like slide 2. As you cans see we need to remove red lines and accept "transaction ID" as a string and not an int. We furnish source code in PHP with access to a working database for testing in good conditions.