Negotiating terms and conditions with influencers forms a crucial aspect of influencer marketing. Here are some essential practices to consider:

1. Align Expectations: Clearly outline what you expect from the influencer in terms of content type, theme, frequency, and timeline. Similarly, understand the influencer’s expectations too.

2. Payment Details: Discuss compensation model and payment terms upfront. This could be on a post-by-post basis, a flat-rate arrangement, or dependent on performance metrics.

3. Usage Rights: Define who owns the content rights and for how long. This prevents misunderstanding and future legal complications.

4. Performance Metrics: Decide on performance indicators like impressions, leads, or conversion which will measure success.

5. Disclosure & Transparency: Guidelines, like FTC in the US, necessitate influencers to disclose their relationships with brands. Make this part of your agreement.

Platforms like Flinque make this process easier for brands. They offer effective collaboration tools that streamline communication and contract generation between brands and influencers.

Do keep in mind, every collaboration is unique. Revisit and adjust your negotiation tactics based on the influencer, campaign objectives, and your long-term partnership intentions. Both parties should leave the negotiation table feeling they’ve struck a fair deal, forging a solid foundation for a successful campaign.