# Check-in

The check-in process in DeGym leverages a robust smart contract system designed to handle interactions securely and efficiently:

1. **Consumer Check-in Initiation**:
   * **Action**: The consumer arrives at the gym and opens the DeGym DApp.
   * **Process**: The consumer selects the check-in option which triggers the app to interact with the smart contract on the blockchain.
2. **Smart Contract Activation**:
   * **Validation**: The smart contract first verifies the authenticity and validity of the consumer's NFT voucher for the current day.
   * **Simultaneous Validation**: The gym’s commitment is verified by checking the staked amount in the blockchain to ensure the gym's eligibility to receive payments.
3. **Conditions Verification**:
   * **Membership Tier**: Checks if the consumer's voucher tier corresponds to the gym's accepted tiers.
   * **Gym Compatibility**: Ensures that the gym is part of the network and ready to accept check-ins from the consumer’s voucher tier.
4. **Transaction and Check-in Execution**:
   * **Payment Transaction**: If all conditions are met, the smart contract facilitates the transfer of funds from the consumer's wallet to the gym's account.
   * **Usage Log**: The smart contract records the use of the voucher for that day, decrementing the available days or sessions from the NFT.
5. **Confirmation and Receipt**:
   * **To Consumer**: The consumer receives a digital receipt and confirmation on their app that the check-in was successful and payment has been made.
   * **To Gym**: The gym receives confirmation that the funds have been transferred to their account and the consumer’s entry is authorized.
6. **Error Handling**:
   * **Insufficient Funds**: If the consumer’s wallet has insufficient funds, the transaction is aborted, and an error is reported.
   * **Invalid Membership**: If the NFT is not valid for the day or tier, the check-in is denied.
7. **Post-Check-in Actions**:
   * **Feedback Request**: The consumer is prompted to rate their experience, providing valuable feedback to the gym.
   * **Usage Analytics**: The gym receives data about the frequency of visits, which helps in planning and resource allocation.

{% @mermaid/diagram content="%%{init: {'theme': ''}}%%

sequenceDiagram
participant U as Consumer
participant App as DeGym App
participant SC as Smart Contract
participant B as BlockDAG/Blockchain
participant G as Gym

```
U->>App: Initiate Check-in
App->>SC: Trigger Smart Contract
SC->>B: Validate Consumer NFT voucher & Gym Stake
B-->>SC: Confirmation of Validity
SC->>SC: Check Membership Tier & Gym Compatibility
SC->>G: Transfer Payment (if valid)
G-->>SC: Confirm Receipt
SC-->>App: Log Usage & Confirm Check-in
App-->>U: Display Confirmation & Request Feedback
G->>B: Update Visit Data
```

" %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.degym.net/dapp/check-in-process.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.