FinTech service account integration

[valb3r]

trafficstars

Create and securely store FinTech service accounts Secrets should be provided to FinTech application with environment variable pattern:

SERVICE_ACCOUNTS_ACCOUNTS[0]_LOGIN
SERVICE_ACCOUNTS_ACCOUNTS[0]_PASSWORD
SERVICE_ACCOUNTS_ACCOUNTS[1]_LOGIN
SERVICE_ACCOUNTS_ACCOUNTS[1]_PASSWORD
...

[nitch2019]

after having real bank for xs2a and the env. accessible

[rain2581]

I think this task is a part of #1182 create secret variables and its already finished