Links-and-resources.md

@@ -76,3 +76,6 @@ Information about Clearing and Settlement in SEPA.
 
 [IBAN Glossary](https://www.iban.com/glossary)
 Some glossary with a few SEPA terms and definitions.
+
+[SEPA Usage Guide](http://www.computerhok.nl/wiki/attach/SEPA/ISO20022_usage_guide_V3.pdf)
+Contains some Customer-2-Bank messages, error codes and flowcharts.
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