How do you properly complete a challenge when completing it manually?

To fully complete a challenge you need to edit both the Nummatches and Value field:

Set the Value field to the challenge's configured maximum payout — the full amount the challenge would pay out upon success.

Set the Nummatches field to match the challenge's Per unit value — the target threshold configured for the challenge. For example, if a challenge requires a specific donor count to succeed, enter that number in Nummatches. The challenge is considered complete when Nummatches equals Per unit.

Note: Once payment processing has completed for the challenge, the Value field becomes read-only and no further edits are possible.