Drupal commerce bug fixes & Payline payment system

Dear all, I/ I have a simple Drupal Commerce website (in dev) but I have found some bugs from modules which are: 1/ Commerce RMA: Working like a charm but when I save a return, it displays this error: Notice: Trying to get property of non-object in commerce_marketplace_order_commerce_line_item_presave() 2/ Commerce coupon & Discount: When I enable these 2 modules, I can't access to a product display anymore. The bugs are described in these pages: [login to view URL] It seems like an issue between commerce discount/coupon reference fields and custom order types (I user Commerce RMA and Commerce marketplace and both add custom order types. 3/ Commerce option stock: I use option sets for user to select a size when shopping. This module is working well but I wanted to couple it with Commerce Options Stock module but can't make it work. When I enable the module, can't access to product display anymore and this error appears: Fatal error: Call to undefined function commerce_stock_product_type_enabled(); Even if this module is in dev., I would like to manage options per stock... The bug has been reported in the module page. 4/ I have a custom price field which does not convert (commerce multicurrency module) when displayed with view (only one display) even after following the solution in here: [login to view URL] II/ Payline payment system: I need to implement the Payline payment system with Drupal commerce [login to view URL] The solution already exists for UC: [login to view URL] Need the same for DC. It is similar to other systems already developed with DC like Ogone, Paybox, SagePay, etc... It will be a simple implementation (one seller) and refunds will not be managed by the system (manually). Thanks.