Backend Integration for Registration Form and PayPal Gateway

We are seeking an experienced backend developer to seamlessly integrate our existing registration form and PayPal Gateway with our backend infrastructure. The frontend components, including the registration form and PayPal script, have already been implemented in our project. Your primary responsibility will be to establish a secure and efficient connection between these frontend elements and our backend.
It's a fairly easy task because everything is already ready and we just need to connect it to the backend. Further details will be discussed through google meet or discord.