Every Time Creates A new Customer when a subscription purchased

Every Time Creates A new Customer when a subscription purchased

I am using the Zoho subscription. I need help with the following.
1. Every time a customer subscribes to each and every plan with the same email address it is creating multiple customers with the same email. This is the problem we see the same customer is creating multiple times. How can we prevent duplication of a customer based on email address in Zoho subscription?
2. I want to show some custom fields to the admin but want to restrict these to a user. How can I do something like that?
          Zoho Marketing Automation
                  • Sticky Posts

                  • Introducing Developer Space in Zoho Subscriptions

                    Hello devs! At Zoho Subscriptions, we're constantly looking for ways to empower the developer community. Our goal is to provide you with the tools you need to integrate Zoho Subscriptions with your other platforms, and we also want to make it easy to

                  Zoho Pagesense Resources

                    Zoho SalesIQ Resources

                          Zoho TeamInbox Resources

                            Zoho DataPrep Resources

                              Zoho CRM Plus Resources

                                Zoho Books Resources

                                  Zoho Subscriptions Resources

                                    Zoho Desk Resources

                                      Zoho Projects Resources

                                        Zoho Sprints Resources

                                          Qntrl Resources

                                            Zoho Creator Resources

                                              Zoho WorkDrive Resources

                                                  Zoho Campaigns Resources

                                                    Zoho CRM Resources

                                                          Design. Discuss. Deliver.

                                                          Create visually engaging stories with Zoho Show.

                                                          Get Started Now