Implement dynamic checkout content

#### Description:

[Description of the task]

#### Acceptance Criteria:
[Note: Use 'Given/When/Then' format if it makes sense to. Otherwise, a simple checklist that can be tested.]

#### Development Checklist:

- [ ] ...
- [ ] ...
- [ ] ...

#### Dependencies

- Blocked by
- Blocking

**Relevant documentation as reference**

**Definition of Ready**

- [ ] Acceptance criteria are included
- [ ] Wireframes are included (if applicable)
- [ ] Design / Solution is accepted by Product Owner (if applicable)
- [ ] Dependencies are identified (technical, business, regulatory/policy)
- [ ] Story has been estimated (under 13 pts)

**Definition of Done**
- In progress:
- [ ] Acceptance criteria are tested (Functionality meets the acceptance criteria defined in the ticket)
- [ ] UI meets accessibility requirements
- [ ] Unit tests are written
- [ ] Work is traceable in GitHub
- [ ] PR linked to ticket number
- [ ] If needed/required - Dev adds flag/label to highlight any migration steps necessary prior to PROD deployment
- Code review:
- [ ] Code is peer reviewed and has passed CI/CD tests
- QA:
- [ ] Acceptance criteria are tested (Functionality meets the acceptance criteria defined in the ticket)
- [ ] Code is potentially shippable to the production environment
- [ ] Functional features have been tested and passed by QA
- [ ] UI components tested by designer
- [ ] Code is deployed to PROD when moved to 'done' column (unless requested otherwise by PO)
- PO Review:
- [ ] Acceptance criteria are tested (Functionality meets the acceptance criteria defined in the ticket)
- [ ] Reviewed and approved by Product Owner

**Security Validation Checklist**
- Security-focused Peer Review:
- [ ] Reviewer explicitly considers abuse cases, privilege boundaries, and insecure patterns.
- Static Analysis Passed:
- [ ] Security linting tools (e.g., Bandit, ESLint plugins, SonarQube) executed and cleared
- Rate Limiting & Bot Defenses Verified:
- [ ] Anti-automation strategies (e.g., throttling, CAPTCHA/Turnstile, scoring) tested and confirmed.
- Threat Model Completed:
- [ ] Developers have identified potential attack vectors (e.g., spoofing, privilege escalation, data leakage), documented mitigations, and validated that defenses align with system goals and fairness principles.

#### Notes:
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The issue does not identify files, entry points, dependencies, acceptance criteria, wireframes, or tests. Start by clarifying what dynamic checkout content means, where checkout is implemented in reserve-rec-api, and the expected behavior; the work is done when agreed acceptance criteria are implemented and tested.

Written by the indexing model from the issue text.