The defense is focusing on the credibility of them both. They accurately claim that their sworn testimony contradicts their public denials of the encounter and payoff.
The redirect addressed this pretty simply: #Individual1 paid them to lie, it was part of the deal.
Defense also puunded on their money and vengeance motives. Again, prosecutors parried: they suffered threats, infamy, and prison. Compensation and retribution are not indications of malice but of justice.