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This article explains how the app handles accounts which are connected to multiple interfaces.

General implementation note

Both import and update flows contain two steps: 1 - downloading accounts and 2 - downloading balances&transactions for accounts. All the logic about capabilities is done after the first step, BUT before the second step. So, after the first step the app initializes/fixes capabilities of accounts. And then the second step is only applied to accounts which have DATA_DOWNLOAD capability connected to the currently used interface.

Import a bank connection

Nothing special: once an account is created, the app always adds a DATA_DOWNLOAD capability to the interface used for the import.

Update a bank connection

When the account is stored/updated in the database, the app checks for each account if it has any other interfaces. And then the logic depends on which interface is used for the update.

Update a bank connection using XS2A

The app adds a DATA_DOWNLOAD capability to all accounts taken from the XS2A interface. If any account has any other interface - the app delete DATA_DOWNLOAD for those interfaces. XS2A has the highest priority.

Update a bank connection using FINTS_SERVER

The app checks for every account taken from the interface if it has any other interface:

• if it has XS2A with DATA_DOWNLOAD capability - the app doesn't add DATA_DOWNLOAD capability, otherwise the capability is added (FINTS_SERVER has middle priority).

• if it has WEB_SCRAPER - the app removes DATA_DOWNLOAD capability for WEB_SCRAPER interface.

Update a bank connection using WEB_SCRAPER

The app checks for every account taken from the interface if it has any other interface:

• if it has XS2A or FINTS_SERVER with DATA_DOWNLOAD

  • the app doesn't add

  DATA_DOWNLOAD capability, otherwise the capability is added (WEB_SCRAPER has the lowest priority).

Connect a new interface

Connect a new XS2A interface

The app downloads all accounts from XS2A interface and matches them to the existing ones. All downloaded accounts have DATA_DOWNLOAD capability. Also, the app checks if any of matched accounts (means there were already imported through another interface) have any other interface connected and removes DATA_DOWNLOAD capability from those interfaces.

Connect a new FINTS_SERVER interface

The app downloads all accounts from FINTS_SERVER interface and matches them to the existing ones. And then the app applies the following logic:

• if an account is a new one (there is no other connected interfaces so far) - the app adds DATA_DOWNLOAD capability to this account.

• if an account is an existing one (there are already other interfaces connected) - the app checks:

  • if the account has XS2A interface with DATA_DOWNLOAD capability - if yes, FINTS_SERVER interface doesn't get DATA_DOWNLOAD capability, otherwise it does get it.

  • if the account has WEB_SCRAPER interface with DATA_DOWNLOAD capability - if yes, the app remove this capability from the WEB_SCRAPER interface

Connect a new WEB_SCRAPER interface

The app downloads all accounts from WEB_SCRAPER interface and matches them to the existing ones. And then the app applies the following logic:

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if an account is a new one (there is no other connected interfaces so far) - the app adds DATA_DOWNLOAD capability to this account.

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