{ "error": "error_code_here", "message": "Human-readable explanation" }

const result = await fetch('https://api.tronnrg.com/delegate', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ tx_hash: hash, delegate_to: addr, signature: sig }), }).then(r => r.json()); if (result.error) { switch (result.error) { case 'payment_verification_failed': // Most common: tx not yet indexed. Wait 3s and retry once. await new Promise(r => setTimeout(r, 3000)); return retry(hash, addr); case 'hash_already_used': // Already claimed. Don't retry. throw new Error('Duplicate delegation attempt'); case 'signature_mismatch': // Signer != payment sender. Sign with the same key. throw new Error('Signer does not match payment sender'); case 'delegation_failed': // Refund queued automatically if payment was verified. if (result.refund) console.log('Refund queued:', result.refund); break; default: console.error(result.error, result.message); } return; } // Success console.log('Delegated:', result.energy, 'energy'); console.log('Delegation tx:', result.delegations[0].tx); // verify on TronScan console.log('Ref:', result.ref);