When using a client repo proxy (which is normal on customer projects not sharing the master credentials) the wagon urls will not work:

                    <configuration>
                        <url>https://repo.backbase.com/specs/accessgroup-integration-service</url>
                        <fromFile>accessgroup-integration-inbound-api-v2.2.0.yaml</fromFile>
                    </configuration>

the /specs path is not a repository (under /repo/specs)

Possible fixes:

1. Add the specs to the repo to make https://repo.backbase.com/repo/specs/accessgroup-integration-service/accessgroup-integration-inbound-api-v2.2.0.yaml work.

2. Use the bom and uzip all specs from a bom version to the downloaded-api folder:

                            <artifactItem>
                                <groupId>com.backbase.dbs</groupId>
                                <artifactId>banking-services-bom</artifactId>
                                <version>${dbs-bom.version}</version>
                                <classifier>api</classifier>
                                <type>zip</type>
                                <outputDirectory>${project.build.directory}/specs</outputDirectory>
                            </artifactItem>
   

Option 2 makes way more sense because then fuel is in sync with a BB release.