Preface

15

Target Audience

15

How to Read This Book

16

How This Book Is Organized

17

Conclusion

19

Acknowledgements

20

1 Introduction to Payment Modernization with SAP

21

1.1 Evolution of Enterprise Payment Processing

21

1.1.1 Background

22

1.1.2 E-Commerce Growth and Payment Gateway Innovation

24

1.1.3 Global Payment Schemes and Regional Innovation

27

1.2 Current Challenges in Payment Management

28

1.2.1 PCI DSS Compliance

28

1.2.2 Payment Method Expansion

29

1.2.3 Manual Processes

30

1.2.4 Integration Complexity

30

1.2.5 Security and Fraud

31

1.3 SAP Digital Payments Add-On Overview

33

1.4 Business Case for Payment Modernization

36

1.4.1 Quantifying Current State Costs

37

1.4.2 Strategic Benefits Beyond Direct Cost Savings

39

1.4.3 Stakeholder Alignment and Business Case Presentation

42

1.4.4 Linking Payment Modernization to Broader Digital Transformation

42

1.5 Summary

43

2 SAP Digital Payments Add-On Architecture

45

2.1 Technical Architecture

45

2.2 Core Components and Services

50

2.2.1 Core Service

50

2.2.2 Routing Engine

52

2.2.3 API Layer (Consumer API)

52

2.2.4 UI Integration APIs

54

2.2.5 PSP Adapters

56

2.2.6 Configuration UI

57

2.2.7 Security Components

61

2.2.8 Logging and Monitoring Services

62

2.3 Integration Points with SAP Landscape

62

2.3.1 SAP S/4HANA Integration

62

2.3.2 Integration with Other SAP Solutions and Third-Party Solutions

66

2.4 Security Architecture and Token Vault

69

2.4.1 PCI DSS Scope Reduction

69

2.4.2 PSP Abstraction, Data Storage, and Token Lifecycle Management

70

2.4.3 Authentication, Authorization, and Secure Credential Storage

71

2.5 High Availability and Scalability

73

2.5.1 High Availability

73

2.5.2 Scalability

74

2.6 Summary

75

3 Setup in SAP BTP

77

3.1 Prerequisites and Entitlements

77

3.1.1 Global Account Requirements

78

3.1.2 Subscription and Service Plans

78

3.1.3 User Types and Access Requirements

79

3.1.4 Add-On Prerequisites

80

3.2 Subscription and Tenant Configuration

80

3.2.1 Accessing the SAP BTP Cockpit

81

3.2.2 Creating Subaccounts

82

3.2.3 Service Marketplace Navigation

84

3.2.4 Add-On Subscription Process

86

3.3 Communication Systems and Arrangements

88

3.3.1 Destination Configuration Basics

89

3.3.2 Add-On-Specific Communication Setup

89

3.4 Security Configuration and Authentication

95

3.4.1 Identity Authentication Overview

95

3.4.2 Trust Configuration Steps

96

3.4.3 Certificate Management

97

3.5 Role Management and Authorizations

97

3.5.1 Role Collections, Users, and Group Management

98

3.5.2 Add-On-Specific Roles

99

3.5.3 Authorization Setup

102

3.6 Testing the Initial Setup

103

3.6.1 Validation Procedures

103

3.6.2 Common Setup Issues

104

3.7 Summary

107

4 Integration with Payment Service Providers

109

4.1 Understanding PSP Integration Architecture

109

4.1.1 Payment Gateway Fundamentals

109

4.1.2 API-Based Integration Patterns

114

4.1.3 PSP Adapter Framework

118

4.2 Setting Up PSP Accounts and API Credentials

122

4.2.1 PSP Account Creation

122

4.2.2 API Keys and Webhooks Overview

129

4.2.3 Test and Production Environments Setup

130

4.3 Configuring PSP Adapter in the Add-On

133

4.3.1 Adapter Installation

134

4.3.2 Configuration Parameters

136

4.3.3 Payment Method Setup

143

4.4 Payment Methods and Currency Configuration

145

4.4.1 Stripe Payment Methods Overview

145

4.4.2 Currency Support and Multimerchant Strategy

146

4.4.3 Level 2 and Level 3 Data Configuration

147

4.4.4 Mail Order/Telephone Order and Offline Mandates Support

147

4.4.5 Enable Specific Methods in the Add-On

148

4.5 Webhook Setup and Event Management

154

4.6 Testing PSP Integration

159

4.7 Summary

162

5 Implementation in SAP ERP

163

5.1 Prerequisites for SAP ERP

163

5.1.1 SAP ERP System Requirements

164

5.1.2 Add-On-Specific SAP Notes Implementation

168

5.2 Payment Card Configuration

206

5.2.1 Payment Card Master Data

207

5.2.2 Payment Card Type Configuration

209

5.3 Sales and Distribution Integration

222

5.3.1 Order Processing with Payment Cards

223

5.3.2 Credit Management Integration

240

5.3.3 Billing Document Processing

242

5.4 ABAP Development and Enhancements

243

5.4.1 User Exits

243

5.4.2 BAdI Framework

245

5.4.3 Add-On-Specific Developments

245

5.5 Authorization and Capture Process

251

5.6 Batch Jobs and Background Processing

253

5.7 Custom Reports and Interfaces

254

5.8 Summary

255

6 Implementation in SAP S/4HANA

257

6.1 Integration Activation in SAP S4HANA

257

6.1.1 Prerequisites and System Requirements

258

6.1.2 SAP Note Identification

258

6.1.3 SAP BTP Subscription and Service Key

260

6.1.4 Technical Integration Configuration for On-Premise Systems

261

6.2 Payment Method Configuration

272

6.2.1 Cross-Application Payment Card Type Configuration

272

6.2.2 Sales Payment Card Configuration

277

6.2.3 Finance Central Settings

288

6.2.4 Customer Master Payment Guarantee Procedure

289

6.2.5 Electronic Bank Statement Configuration for Payment Advice

290

6.2.6 Tax Configuration for PSP Fees

293

6.3 SAP Fiori Apps and User Interface

294

6.3.1 Master Data Management Apps

294

6.3.2 Manage Sales Orders App

299

6.3.3 Schedule Accounts Receivable Jobs App

300

6.3.4 Display Payment Card Data App

307

6.3.5 Exception Handling Apps

307

6.3.6 Refund and Reversal Processing Apps

308

6.4 Order-to-Cash Process Integration

309

6.4.1 Payment Card Registration

310

6.4.2 Sales Order Creation with Payment Authorization

310

6.4.3 Delivery Processing with Authorization Validation

313

6.4.4 Billing Document Creation and Financial Posting

314

6.4.5 Settlement Processing and Capture

315

6.4.6 Payment Advice Processing and Reconciliation

315

6.4.7 Exception Handling and Problem Resolution

316

6.4.8 Bank Statement Reconciliation

317

6.5 Cloud Versus On-Premise Considerations

318

6.5.1 Configuration Approach Differences

319

6.5.2 Feature Availability and Release Timing

320

6.5.3 Migration Scenarios and Upgrade Paths

320

6.5.4 Hybrid Deployment Strategies

321

6.6 Summary

321

7 Security and Compliance

323

7.1 PCI DSS Compliance Strategy

324

7.1.1 Understanding the PCI DSS Scope

324

7.1.2 PCI DSS Compliance Levels

325

7.1.3 SAP Self-Assessment Questionnaire Type

326

7.1.4 Compliance Strategy Framework

328

7.1.5 Compliance Responsibility Matrix

329

7.1.6 Annual Assessment Preparation

330

7.2 Tokenization Implementation

332

7.2.1 Architecture

332

7.2.2 Types and Format

333

7.2.3 Lifecycle States

334

7.2.4 Storage in SAP

334

7.2.5 API Workflow

335

7.2.6 Validation and Verification

335

7.2.7 Reuse and Multiuse Tokens

336

7.2.8 Expiration Handling

337

7.2.9 Deletion and Data Retention

337

7.2.10 Integration Patterns

338

7.3 Encryption and Key Management

339

7.3.1 Encryption in Transit

339

7.3.2 Cipher Suite Selection

341

7.3.3 Certificate Management

341

7.3.4 Encryption at Rest

341

7.3.5 Key Management for Encryption

342

7.4 Audit Logging and Monitoring

344

7.5 GDPR and Data Privacy

348

7.5.1 GDPR Principles for Payment Processing

348

7.5.2 Data Subject Rights in Payment Systems

349

7.5.3 Lawful Bases for Processing Payment Data

350

7.5.4 Cross-Border Data Transfers

351

7.5.5 Privacy by Design and Default

352

7.6 Security Testing and Validation

352

7.6.1 Security Testing Methodology

352

7.6.2 Vulnerability Scanning Requirements

353

7.6.3 Penetration Testing Procedures

354

7.6.4 Code Security Review

354

7.6.5 Security Testing During Development

355

7.6.6 Ongoing Validation and Continuous Monitoring

356

7.7 Summary

357

8 Testing and Troubleshooting

359

8.1 Test Strategy and Planning

359

8.2 Setting Up Test Environments

362

8.2.1 Postman Setup for API Testing

363

8.2.2 SAP ERP Test System Configuration

367

8.3 Test Scenarios and Scripts

368

8.3.1 Card Registration and Token Management

368

8.3.2 Authorization

371

8.3.3 Successful Settlement

376

8.3.4 Refund Test Scenarios

378

8.3.5 E-Commerce Integration

379

8.4 Performance Testing

383

8.5 Common Issues and Resolution

385

8.6 Log Analysis and Debugging

385

8.7 Summary

390

9 Go-Live and Administration

391

9.1 Go-Live Planning and Preparation

391

9.1.1 Deployment Approaches

392

9.1.2 Go-Live Readiness Assessment

393

9.2 Migration from Legacy Systems

400

9.3 Cutover Procedures

401

9.4 Post Go-Live Support

402

9.4.1 Hypercare Phase Structure

402

9.4.2 Knowledge Transfer and Documentation

404

9.5 Operational Monitoring

406

9.5.1 Application Log Monitoring

406

9.5.2 Batch Job Monitoring

407

9.5.3 Automated Performance Monitoring

408

9.6 Maintenance and Optimization

409

9.7 Summary

410

10 Processing Digital Payments

411

10.1 Customer Service Payment Operations

411

10.1.1 Processing Orders with Payment Cards

412

10.1.2 Handling Payment Failures

416

10.1.3 Managing Authorization Expiration in SAP ERP

418

10.1.4 Managing Authorization Expiration in SAP S/4HANA

419

10.1.5 Customer Payment Enquiries

419

10.2 Finance Operations

422

10.2.1 Refund and Credit Memo Processing

422

10.2.2 Dispute and Chargeback Management

429

10.2.3 Month-End Procedures

432

10.3 Training and Change Management

433

10.3.1 Role-Based Training

434

10.3.2 Best Practices for User Adoption

435

10.3.3 Common Challenges and Support Procedures

436

10.4 Summary

439