--- title: Learn SAP from the Experts | The SAP PRESS Blog | Paul Hardy description: Paul Hardy is a senior ABAP developer at Hanson and has worked on SAP rollouts at multiple companies all over the world. --- [![rheinwerk-sappress-logo-header-1](https://blog.sap-press.com/hubfs/rheinwerk-sappress-logo-header-1.svg)](https://blog.sap-press.com/) [Blog](https://blog.sap-press.com) - Books - Get an overview of our books and courses on every relevant SAP topic. - [Programming](https://sap-press.com/programming/) - [Administration](https://sap-press.com/administration/) - [BI](https://sap-press.com/business-intelligence/) - [Finance](https://sap-press.com/finance-controlling/) - [Logistics](https://sap-press.com/logistics/) - [HR](https://sap-press.com/human-resources/) - [CRM & Sales](https://sap-press.com/marketing-sales/) - [HANA](https://sap-press.com/hana/) - [Introductions](https://sap-press.com/introductions/) - [E-Bites](https://sap-press.com/e-bites/) - [Certification Guides](https://www.sap-press.com/certification-guides/) - [Rheinwerk Courses](https://www.sap-press.com/online-courses/) - Book Subscription - Get unlimited access to all SAP PRESS books! - [SAP PRESS Subscription](https://sap-press.com/subscriptions/) ![](https://blog.sap-press.com/hs-fs/hubfs/Exploring%20the%20Architecture%20of%20the%20SAP%20Digital%20Payments%20Add-On.jpg?width=1000&name=Exploring%20the%20Architecture%20of%20the%20SAP%20Digital%20Payments%20Add-On.jpg) [FICO](https://blog.sap-press.com/tag/fico) | Featured article ## [Exploring the Architecture of the SAP Digital Payments Add-On](https://blog.sap-press.com/exploring-the-architecture-of-the-sap-digital-payments-add-on) The SAP digital payments add-on is a cloud-based middleware component hosted on SAP BTP. ![SAP PRESS](https://blog.sap-press.com/hubfs/Twitter_profile_pic.svg) by [SAP PRESS](https://blog.sap-press.com/author/sap-press) [Read More](https://blog.sap-press.com/exploring-the-architecture-of-the-sap-digital-payments-add-on) ![Paul Hardy](https://blog.sap-press.com/hubfs/Paul%20Hardy.png) **Paul Hardy** Paul Hardy is a senior ABAP developer at Hanson and has worked on SAP rollouts at multiple companies all over the world. # Blogs by Paul Hardy [![ABAP Q&A: CDS Views, ABAP RAP, and JOINS](https://blog.sap-press.com/hs-fs/hubfs/ABAP%20Q%26A%20CDS%20Views%20and%20Entities%2c%20ABAP%20RESTful%20Application%20Programming%20Model%2c%20and%20JOINS.png?height=600&name=ABAP%20Q&A%20CDS%20Views%20and%20Entities,%20ABAP%20RESTful%20Application%20Programming%20Model,%20and%20JOINS.png)](https://blog.sap-press.com/abap-qa-cds-views-and-entities-abap-restful-application-programming-model-and-joins) [Programming](https://blog.sap-press.com/tag/programming) ## [ABAP Q&A: CDS Views, ABAP RAP, and JOINS](https://blog.sap-press.com/abap-qa-cds-views-and-entities-abap-restful-application-programming-model-and-joins) Earlier this year I took part in the SAP PRESS Book Club webinar series, where I answered reader questions about ABAP development over the course of... ![Paul Hardy](https://blog.sap-press.com/hubfs/Paul%20Hardy.png) by [Paul Hardy](https://blog.sap-press.com/author/paul-hardy) [Read More](https://blog.sap-press.com/abap-qa-cds-views-and-entities-abap-restful-application-programming-model-and-joins) [![ABAP Room 101 – The Worst Thing in the World](https://blog.sap-press.com/hs-fs/hubfs/ABAP%20Room%20101%20%E2%80%93%20The%20Worst%20Thing%20in%20the%20World.png?height=600&name=ABAP%20Room%20101%20%E2%80%93%20The%20Worst%20Thing%20in%20the%20World.png)](https://blog.sap-press.com/abap-room-101-the-worst-thing-in-the-world) [Programming](https://blog.sap-press.com/tag/programming) ## [ABAP Room 101 – The Worst Thing in the World](https://blog.sap-press.com/abap-room-101-the-worst-thing-in-the-world) In the novel *1984* by George Orwell the way Big Brother would break prisoners was by taking them into Room 101. In that room, what awaited each... ![Paul Hardy](https://blog.sap-press.com/hubfs/Paul%20Hardy.png) by [Paul Hardy](https://blog.sap-press.com/author/paul-hardy) [Read More](https://blog.sap-press.com/abap-room-101-the-worst-thing-in-the-world) [![Introducing the Concept of Antifragile ABAP](https://blog.sap-press.com/hs-fs/hubfs/Antifragile%20ABAP%E2%80%94Combining%20SAP%20Development%20with%E2%80%A6Philosophy.png?height=600&name=Antifragile%20ABAP%E2%80%94Combining%20SAP%20Development%20with%E2%80%A6Philosophy.png)](https://blog.sap-press.com/introducing-the-concept-of-antifragile-abap) [Programming](https://blog.sap-press.com/tag/programming) ## [Introducing the Concept of Antifragile ABAP](https://blog.sap-press.com/introducing-the-concept-of-antifragile-abap) As a general rule, you don’t find too many computer programmers reading books on philosophy. They prefer the binary world of ones and zeros and... ![Paul Hardy](https://blog.sap-press.com/hubfs/Paul%20Hardy.png) by [Paul Hardy](https://blog.sap-press.com/author/paul-hardy) [Read More](https://blog.sap-press.com/introducing-the-concept-of-antifragile-abap) [![ABAP Q&A: Your ABAP Questions Answered by Paul Hardy](https://blog.sap-press.com/hs-fs/hubfs/Your%20ABAP%20Questions%2c%20Answered%20by%20Paul%20Hardy.png?height=600&name=Your%20ABAP%20Questions,%20Answered%20by%20Paul%20Hardy.png)](https://blog.sap-press.com/authorqanda/paul-hardy) [Programming](https://blog.sap-press.com/tag/programming) ## [ABAP Q&A: Your ABAP Questions Answered by Paul Hardy](https://blog.sap-press.com/authorqanda/paul-hardy) Recently, we asked you for your [ABAP](https://learning.sap-press.com/abap)questions so that Paul Hardy, SAP Mentor and author of numerous ABAP books, could answer them. Here’s what he... ![Paul Hardy](https://blog.sap-press.com/hubfs/Paul%20Hardy.png) by [Paul Hardy](https://blog.sap-press.com/author/paul-hardy) [Read More](https://blog.sap-press.com/authorqanda/paul-hardy) [![Taking the ABAP Pain Out of Upgrades](https://blog.sap-press.com/hs-fs/hubfs/Taking%20the%20ABAP%20Pain%20Out%20of%20Upgrades.png?height=600&name=Taking%20the%20ABAP%20Pain%20Out%20of%20Upgrades.png)](https://blog.sap-press.com/taking-the-abap-pain-out-of-upgrades) [Programming](https://blog.sap-press.com/tag/programming) ## [Taking the ABAP Pain Out of Upgrades](https://blog.sap-press.com/taking-the-abap-pain-out-of-upgrades) In this wonderful software world in which we live it has been said that the best and worst thing about the current state of affairs is the... ![Paul Hardy](https://blog.sap-press.com/hubfs/Paul%20Hardy.png) by [Paul Hardy](https://blog.sap-press.com/author/paul-hardy) [Read More](https://blog.sap-press.com/taking-the-abap-pain-out-of-upgrades) ### SAP Blog Topics - [All SAP Topics](https://blog.sap-press.com) - [Logistics](https://blog.sap-press.com/tag/logistics) - [Programming](https://blog.sap-press.com/tag/programming) - [FICO](https://blog.sap-press.com/tag/fico) - [Administration](https://blog.sap-press.com/tag/administration) - [Featured](https://blog.sap-press.com/tag/featured) - [Business Intelligence](https://blog.sap-press.com/tag/business-intelligence) - [What Is?](https://blog.sap-press.com/tag/what-is) - [CRM & Sales](https://blog.sap-press.com/tag/crm-sales) - [Video](https://blog.sap-press.com/tag/video) - [Human Resources](https://blog.sap-press.com/tag/human-resources) **Subscribe to our blog!**Get notified about future blog updates. - - - - - ### Most Popular Blog Posts 1. 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