Code real-time login feedback for web form entry of third-party utility company online account login credentials

Our company provides renewable energy to households and businesses across the U.S. using the energy usage information available in our customers online accounts with their local electric utility company. As such, with our customers legal consent, our customers link our system to their personal online account with their local electric utility by providing their login credentials in an online form as part of the new customer signup process. We are in need of a system that checks in real-time that the login credentials they provide match the values that work with their online utility account. Such a system would give our new signup customers an error message if the credentials they provide do not open their utility account and would give them the opportunity to re-enter the credentials, as is quite typical of login forms. This would greatly increase number of correctly entered login credentials. So the required code would test the entered credentials in the utility companies login form and provide an error if needed. My guess is that this would testing would be done with a POST call to the utility companies login form. We will eventually want to code this function for 1,600 separate utility companies. This current job posting will be for the first 100 utility companies. Our hope is that we find that the different form POST calls will not need be too different from for each of the utility companies. So that a great deal of code can be reused for the various utilities. We currently have forms developed in the Caspio platform that lets users enter their zip code and select their electric utility from a list of local utilities. The user is then presented with a form for linking their account that looks much like a login form, which displays the utility companies logo and provides several utility specific url links. We have a database of utility companies, login page urls, etc. If the required code could be integrated into the current Caspio forms, this would be preferred. Otherwise, this job includes the development of replacement forms. See these forms here: [login to view URL]@[login to view URL] and here: [login to view URL] Please include in your estimate the methods you'd use, and demonstrate that you've looked into the problems and utility company login forms specifically. If my guess at the required budget is off, please bid anyways. The project will be reward based on experience and price and demonstration that the project is understood and can be completed in a timely manner and with quality and communication. Satisfactory completion of the current job posted for the first 100 utility companies, will very likely lead to the reward of the remaining 1,500. Any fitting programming language or tools can be used. Attached is a small sample of utility companies.