Integration of Mollie online payments in simple php/mysql webshop -- 2

PHP/MYSQL website - cart content is stored in a session variable. When checking out the customer has 3 options : - offline payment when picking up goods at the store (not in scope of project) - offline money transfer (not in scope of project) - offline payment via Mollie payment solution ([login to view URL]) What needs to be developed : 1/ integration of Mollie online payment 2/ actual checkout & stock - when customer checks out the following details are available in a session variable : - general order data (timestamp / ID / ref number / ...) - product ID / unit price / description / quantity ordered ( x number of products bought) - customer data (name / address / ...) - if payment fails : redirect to cart page to choose different payment method - if payment is a success : redirect to confirmation page + decrease item stock with quantity sold + auto mail to shop owner + auto mail to client (content of both auto mails not in scope of project) Timing : work needs to be done by end of week 39 (29/09/19) & can be started on 22/09/19.