Overlay OBeP Scheme: Similar to the Multi-Bank or Mono-Bank scheme, however, there is a third party (the overlay provider) who sits between the payment network and the consumer. The overlay provider requires the consumer to share their online banking credentials with them in order to have access to the consumer’s bank account and to initiate the credit transfer to the merchant. (e.g. SOFORT banking, or SOFORT Überweisung)
Head over to Amazon and search for some books about your topic. Have a quick look at the Table of Contents section of the books (to give you an idea of what topics were covered), and more importantly, read the reviews that were left by readers. Negative reviews will often reveal the topics that readers were hoping would be covered (or covered in more detail) in the book, but were not.
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