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+# Integration Testing Instructions from Scratch
+
+This document provides step-by-step instructions for setting up and running integration tests for indexer-rs from a fresh repository checkout.
+
+## Prerequisites
+
+Before starting, ensure you have the following tools installed:
+
+- **Docker**: `docker --version` (tested with 28.3.2)
+- **Docker Compose**: `docker compose version` (tested with v2.38.2)
+- **Rust/Cargo**: `cargo --version` (tested with 1.88.0)
+- **Just**: `just --version` (tested with 1.40.0)
+
+## Step 1: Initial Setup
+
+1. **Navigate to repository root**:
+
+   ```bash
+   cd /path/to/indexer-rs
+   ```
+
+2. **Verify git status**:
+
+   ```bash
+   git status
+   ```
+
+   Expected: Clean working directory on main branch.
+
+## Step 2: Clean Environment
+
+**Clean any existing containers**:
+
+```bash
+just down
+```
+
+This removes all containers and networks from previous test runs.
+
+## Step 3: Full Test Network Setup
+
+**Start the complete test environment**:
+
+```bash
+just setup
+```
+
+This command:
+
+- Clones the local-network repository (branch: `suchapalaver/test/horizon`)
+- Starts blockchain, IPFS, PostgreSQL, and Graph Node
+- Deploys Graph Protocol contracts (both Legacy and Horizon)
+- Deploys TAP contracts
+- Builds and starts indexer-service and tap-agent
+- Deploys network subgraph with TAP v2 support
+- Starts supporting services (gateway, TAP aggregator, etc.)
+
+**Expected output**: All services should start successfully without errors.
+
+## Step 4: Verify Services Are Running
+
+**Check that all critical services are healthy**:
+
+```bash
+docker ps --format "table {{.Names}}\t{{.Status}}" | grep -E "(indexer-service|tap-agent|gateway|graph-node|chain)"
+```
+
+Expected output:
+
+```
+indexer-service      Up X minutes (healthy)
+tap-agent            Up X minutes (healthy)
+gateway              Up X minutes
+graph-node           Up X minutes (healthy)
+chain                Up X minutes (healthy)
+```
+
+## Step 5: Fund Escrow Accounts
+
+**Fund both V1 and V2 escrow accounts**:
+
+```bash
+cd integration-tests && ./fund_escrow.sh
+```
+
+**Expected output**:
+
+- V1 escrow successfully funded with 10 GRT
+- V2 escrow successfully funded with 10 GRT
+- Both transactions should show success confirmations
+
+## Step 6: Verify Horizon Detection
+
+**Check if indexer-service detects Horizon contracts**:
+
+```bash
+docker logs indexer-service 2>&1 | grep -i horizon | tail -3
+```
+
+**Expected output**:
+
+```
+Horizon contracts detected in network subgraph - enabling hybrid migration mode
+Horizon contracts detected - using Horizon migration mode: V2 receipts only, but processing existing V1 receipts
+```
+
+## Step 7: Run V1 Integration Tests
+
+**Test Legacy TAP (V1) functionality**:
+
+```bash
+just test-local
+```
+
+**Expected behavior**:
+
+- Funds V1 escrow accounts
+- Sends multiple batches of V1 receipts
+- Waits for timestamp buffer period
+- Sends trigger receipts until RAV generation is detected
+- **Success criteria**: Either RAVs created increases OR unaggregated fees decrease significantly
+
+## Step 8: Run V2 Integration Tests
+
+**Test Horizon TAP (V2) functionality**:
+
+```bash
+just test-local-v2
+```
+
+**Expected behavior**:
+
+- Funds both V1 and V2 escrow accounts
+- Sends V2 receipts with collection IDs
+- Monitors metrics for RAV generation
+- **Success criteria**: V2 receipts are accepted (no "402 Payment Required" errors)
+
+## Step 9: Run Load Tests
+
+**Test system performance with high receipt volume**:
+
+```bash
+just load-test-v2 1000
+```
+
+This sends 1000 V2 receipts to test system performance.
+
+## Step 10: Observe and Debug
+
+### Check Network Subgraph
+
+**Verify PaymentsEscrow accounts are indexed**:
+
+```bash
+curl -s -X POST http://localhost:8000/subgraphs/name/graph-network \
+  -H "Content-Type: application/json" \
+  -d '{"query": "{ paymentsEscrowAccounts(first: 5) { id payer receiver balance } }"}' | jq
+```
+
+**Expected output**:
+
+```json
+{
+  "data": {
+    "paymentsEscrowAccounts": [
+      {
+        "id": "0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266f39fd6e51aad88f6f4ce6ab8827279cfffb92266f4ef6650e48d099a4972ea5b414dab86e1998bd3",
+        "payer": "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
+        "receiver": "0xf4EF6650E48d099a4972ea5B414daB86e1998Bd3",
+        "balance": "10000000000000000000"
+      }
+    ]
+  }
+}
+```
+
+### Check Service Logs
+
+**Monitor indexer-service logs**:
+
+```bash
+docker logs indexer-service -f
+```
+
+**Monitor tap-agent logs**:
+
+```bash
+docker logs tap-agent -f
+```
+
+### Check Metrics
+
+**Check TAP agent metrics**:
+
+```bash
+curl -s http://localhost:7300/metrics | grep -E "(tap_ravs_created|tap_unaggregated_fees)"
+```
+
+## Step 11: Development Workflow
+
+### Hot Reloading
+
+**Rebuild and restart services after code changes**:
+
+```bash
+just reload
+```
+
+### View All Service Logs
+
+**Monitor all service logs**:
+
+```bash
+just logs
+```
+
+### Stop All Services
+
+**Clean shutdown**:
+
+```bash
+just down
+```
+
+## Troubleshooting
+
+### Common Issues
+
+1. **"402 Payment Required" errors**:
+   - Verify escrow accounts are funded
+   - Check that Horizon detection is working
+   - Ensure network subgraph has PaymentsEscrow accounts
+
+2. **Service startup failures**:
+   - Run `just down` to clean state
+   - Check Docker daemon is running
+   - Verify port availability (7300, 7601, 7700, 8000, 8545)
+
+3. **Network subgraph issues**:
+   - Check graph-node logs: `docker logs graph-node`
+   - Verify contracts are deployed: `docker logs graph-contracts`
+
+4. **Test timeouts**:
+   - Services may take time to start
+   - RAV generation depends on receipt volume and timing
+   - Check service health with `docker ps`
+
+### Debug Commands
+
+**Check contract deployment**:
+
+```bash
+# Check if contracts have code
+docker exec chain cast code 0xE6E340D132b5f46d1e472DebcD681B2aBc16e57E --rpc-url http://localhost:8545 | wc -c
+```
+
+**Check blockchain state**:
+
+```bash
+# Get current block number
+docker exec chain cast block-number --rpc-url http://localhost:8545
+```
+
+**Check database state**:
+
+```bash
+# Check for TAP receipts
+docker exec postgres psql -U postgres -d indexer_components_1 -c "SELECT COUNT(*) FROM scalar_tap_receipts;"
+```
+
+## Test Success Criteria
+
+### V1 Tests
+
+- ✅ Receipts are accepted without errors
+- ✅ RAVs are generated (metrics show increase)
+- ✅ Unaggregated fees decrease after RAV generation
+
+### V2 Tests
+
+- ✅ V2 receipts are accepted without "402 Payment Required" errors
+- ✅ System runs in Horizon hybrid migration mode
+- ✅ Collection IDs are properly handled
+
+### Load Tests
+
+- ✅ System handles high receipt volume without errors
+- ✅ Memory usage remains stable
+- ✅ No significant performance degradation
+
+## Key Configuration Files
+
+- `contrib/indexer-service/config.toml`: Indexer service configuration
+- `contrib/tap-agent/config.toml`: TAP agent configuration
+- `contrib/local-network/.env`: Environment variables and addresses
+- `contrib/local-network/horizon.json`: Horizon contract addresses
+- `contrib/local-network/tap-contracts.json`: TAP contract addresses
+
+## Next Steps
+
+After successful testing, consider:
+
+1. **Run comprehensive test suite**: `just ci` (includes format, lint, test, sqlx-prepare)
+2. **Explore refactoring opportunities**: Review `INTEGRATION_TESTING_IMPROVEMENTS.md`
+3. **Contribute improvements**: Follow the refactoring roadmap for better testing infrastructure
+
+This testing infrastructure provides a solid foundation for developing and testing both V1 and V2 TAP functionality in indexer-rs.
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