1. A system for inserting supplemental computer instructions into an application, the system comprising: processor; a developer portal configured to store item metadata and sales options; a decompiler configured to decompile application computer instructions; a parser configured to identify one or more locations within the decompiled application computer instructions for insertion of supplemental computer instructions; a computer instructions generator configured to generate the supplemental computer instructions based, at least in part, on the item metadata, the sales options, and the one or more identified locations, wherein at least a portion of the supplemental computer instructions, when executed, enables a user of the application to make a transaction for the one or more items; and a compiler configured to create a compiled application by compiling the decompiled application computer instruction with the supplemental computer instructions inserted at the one or more locations.