Build me an API

Please Implement below API, 1. Registration service with /users endpoint for taking a JSON body with details such as, FIELDS & VALIDATIONS  Username - alphanumeric, no spaces  Password – min length 8, at least one upper case letter & number  Email – email id with email format  DoB (Date of Birth) - ISO 8601 format  Credit Card Number – This field is optional. If given should have 16 digits. EXPECTED RESPONSES:  If the request body fails to satisfy any of the basic validation checks return HTTP Status code: 400  Reject requests if the user is under the age of 18 and return HTTP Status code: 403  If the username has already been used reject the request and return HTTP Status code: 409  A successful action should return HTTP Status code: 201 GET /users endpoint: Consumer should be able to provide a filter (CreditCard=Yes/No) in his request. If “Yes” then should return Users registered with Credit Card Number. If “No” then return Users registered without a Credit Card Number. Without any filter should return all the Registered Users. 2. Payment service with /payments endpoint for taking a JSON body with details such as, FIELDS & VALIDATIONS  Credit Card Number – 16 digits  Amount – 3 digits EXPECTED RESPONSES:  If the request body fails to satisfy any of the basic validation checks return HTTP Status code: 400  If credit card number is not registered against any Registered User return HTTP Status code: 404  A successful payment should return HTTP Status code: 201 REQUIREMENTS:  You are free to use any Programming Language or Framework you are comfortable with (Node.js express with nodemon?)  Please include instructions for running the application  We don’t need you to implement any Frontend code  No need to use any Databases/in-memory Databases. You can use language provided data structures in place of that.  We expect you to provide Unit Tests for your solution (Use postman)