Get sandbox test merchants

{
    "merchants": [
        {
            "tier": "A",
            "email": "tier-a@sandbox.opensylo.com",
            "password": "SandboxTierA123!",
            "creditScore": 85,
            "riskLevel": "Low",
            "lendingCap": 10000000,
            "description": "Premium approval flow"
        },
        {
            "tier": "B",
            "email": "tier-b@sandbox.opensylo.com",
            "password": "SandboxTierB123!",
            "creditScore": 72,
            "riskLevel": "Low",
            "lendingCap": 5000000,
            "description": "Standard approval flow"
        },
        {
            "tier": "C",
            "email": "tier-c@sandbox.opensylo.com",
            "password": "SandboxTierC123!",
            "creditScore": 55,
            "riskLevel": "Medium",
            "lendingCap": 2000000,
            "description": "Conditional approval"
        },
        {
            "tier": "D",
            "email": "tier-d@sandbox.opensylo.com",
            "password": "SandboxTierD123!",
            "creditScore": 40,
            "riskLevel": "High",
            "lendingCap": 500000,
            "description": "Pilot/small ticket"
        },
        {
            "tier": "E",
            "email": "tier-e@sandbox.opensylo.com",
            "password": "SandboxTierE123!",
            "creditScore": 25,
            "riskLevel": "Very High",
            "lendingCap": 0,
            "description": "Rejection flow"
        }
    ]
}