# Core Concepts

Business rules explain why concepts exist within Second

[**Time-Based - Business Rules**](/v2.0/core-concepts/time-based-rendering-type.md)

Used for marketplaces offering services per unit time

[**Flat-Rate - Business Rules**](/v2.0/core-concepts/flat-rate-rendering-type.md)

Used when multiple services are put in a single listing and askers book multiple services within a single booking.

[**Seat-Based - Business Rules**](/v2.0/core-concepts/seat-based-rendering-type.md)

Used when vendors can provide multiple sessions for a type of service

[**User search feature - Business Rules**](/v2.0/core-concepts/user-search-feature.md)

Allows platform users to search for other users within the platform

[**Calendar Sync feature - Business Rules**](/v2.0/core-concepts/calendar-sync-feature.md)

Allows users to sync their calendars with the platform

[**Mediation feature - Business Rules**](/v2.0/core-concepts/mediation-feature.md)

Allows users and the super administrator/administrators to resolve disagreements arising from automated processes on the platform

[**Typesense Feature**](/v2.0/core-concepts/typesense-feature.md)

Allows keyword searches through the listings its key elements

[**Listing Alert feature - Business Rules**](/v2.0/core-concepts/listing-alert-feature.md)

Enables alerts every time a listing is published

[**Listing Option feature - Business Rules**](/v2.0/core-concepts/upgrades-feature.md)

Enables optional offerings within a service

[**Coupon - Business Rules**](/v2.0/core-concepts/coupon-feature.md)

Enables the provision of vouchers to customers while making a purchase

[**SMS Feature - Business Rules**](/v2.0/core-concepts/sms-feature.md)

Useful for low internet access users to receive notifications by SMS

[**Quote feature - Business Rules**](/v2.0/core-concepts/quote-feature.md)

Allows askers to send specific requests to an offeror

[**Listing Search Advanced feature - Business Rules**](/v2.0/core-concepts/listing-search-advanced-feature.md)

Allows users to search listings using a predetermined algorithm

[**Recaptcha feature - Business Rules**](/v2.0/core-concepts/recaptcha-feature.md)

Improves security by conducting checks to determine if a user is a robot or not

[**Payment Service Provider (PSP) - Business Rules**](/v2.0/core-concepts/payment-service-provider-features-psp.md)

Connects payment providers to the marketplace

[**Stock - Business Rules**](/v2.0/core-concepts/seat-based-rendering-type/stock-feature.md)

Allows for Blindside fixed prices marketplaces

[**Request for proposal bundle (RFP) - Business Rules**](/v2.0/core-concepts/request-for-proposal-bundle-rfp.md)

Allows askers to make calls for tenders

[**Search Engine Optimization (SEO) - Business Rules**](/v2.0/core-concepts/search-engine-optimization-seo.md)

Improve the visibility/position of a website as a top result of a search

[**Maildev - Business Rules**](/v2.0/core-concepts/maildev.md)

Allows testing automatic email on all marketplaces

[**Audit - Business Rules**](/v2.0/core-concepts/audit.md)

Records the flow of actions on the platform

[**General Data Protection Regulation (GDPR) - Business Rules**](/v2.0/core-concepts/general-data-protection-regulation-gdpr.md)

This documentation is intended to shed light on the rules within Second.

[**Google tools - Business Rules**](/v2.0/core-concepts/google-tools.md)

To analyze users data of your platform

[**Users onboarding - Business Rules**](/v2.0/core-concepts/users-onboarding.md)


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