A computing system may include a network circuit configured to communicate with a third party computing device via a network, one or more interface elements (e.g., application programming interfaces and/or software development kits) providing account open functionality, and an account open circuit configured to: accept, via the interface elements, a set of user data and an account open request for opening a new account with the provider, where the set of user data is received from a user computing device of a user via a third party website or application; establish the new account by generating a set of account data associated with the new account without directing the user to the operating environment of a website or application of the provider; and transmit the set of account data to the third party computing device for use by the third party computing device in a transaction with the user.