You can start using MockBank to test your application in under 5 minutes. If you (like us) don’t like reading long tutorials and just want to try
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things quickly, just follow a few simple steps
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1. Complete MockBank registration.
below.
These are the steps:
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Steps
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Where to start
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Activate an account from your email
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That is it 
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2. Login to Admin-Console and check you test-customer
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https://bank-dev-adminui.openbankinglab.com/login
Note customers username and password - you will need it on the next step.
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3. Connect via AISP or directly using XS2A API
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For AISP integration: Just select MockBank from list of financial institutions supported by AISP. Check Connect MockBank via AISP for more details.
For direct integration: Check our API Reference out.
We have put those steps into a bit more details here:
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Step 3 - confirm your Email address
You should have received an email (check your spam folder if you haven’t) .
Just follow the link. The link is valid for 48 hours.
The link also logs you in so you can start using MockBank right away. Have a look at Working with Admin-Console to see what you can do there.