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Installing sumUp for Jira Cloud is straightforward:

Get the sumUp app from the Atlassian marketplace
Add sumUp for Jira Cloud directly from your UPM:

Head over to Apps → Explore more apps.

Search for sumUp.

sumUp for Jira Cloud > Install sumUp for Jira Cloud > Search SumUp Cloud Apps.png

Have a look at First steps to start customizing your gadgets.