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docs: document paymentRail option for transfer-out #536

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docs: document paymentRail option for transfer-out #536

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7 changes: 6 additions & 1 deletion mintlify/payouts-and-b2b/payment-flow/send-payment.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -74,12 +74,17 @@ curl -X POST 'https://api.lightspark.com/grid/2025-10-13/transfer-out' \
"accountId": "InternalAccount:a12dcbd6-dced-4ec4-b756-3c3a9ea3d123"
},
"destination": {
"accountId": "ExternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965"
"accountId": "ExternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965",
"paymentRail": "ACH"
},
"amount": 12550
}'
```

<Tip>
The `paymentRail` field is optional. If omitted, Grid selects a default rail for the destination. Specify a rail (e.g., `ACH`, `WIRE`, `RTP`, `FEDNOW`) when you need to control which payment network processes the transfer.
</Tip>


```json Success (201 Created)
{
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6 changes: 5 additions & 1 deletion mintlify/snippets/sending/same-currency.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -32,11 +32,15 @@ curl -X POST 'https://api.lightspark.com/grid/2025-10-13/transfer-out' \
-H 'Content-Type: application/json' \
-d '{
"source": { "accountId": "InternalAccount:a12dcbd6-dced-4ec4-b756-3c3a9ea3d123" },
"destination": { "accountId": "ExternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965" },
"destination": { "accountId": "ExternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965", "paymentRail": "ACH" },
"amount": 12550
}'
```

<Tip>
The `paymentRail` field is optional. If omitted, Grid selects a default rail for the destination.
</Tip>
Comment on lines +40 to +42
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@greptile-apps greptile-apps Bot Jun 2, 2026

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P2 The <Tip> in the snippet is more terse than the equivalent tip in send-payment.mdx, which additionally lists valid rail values and explains when to use them. Since this snippet is imported in global-p2p/sending-receiving-payments/sending-payments.mdx, users landing on that page receive less guidance than users reading send-payment.mdx. Aligning the two tips ensures consistent documentation coverage regardless of which page a developer reaches.

Suggested change
<Tip>
The `paymentRail` field is optional. If omitted, Grid selects a default rail for the destination.
</Tip>
<Tip>
The `paymentRail` field is optional. If omitted, Grid selects a default rail for the destination. Specify a rail (e.g., `ACH`, `WIRE`, `RTP`, `FEDNOW`) when you need to control which payment network processes the transfer.
</Tip>
Prompt To Fix With AI 
This is a comment left during a code review.
Path: mintlify/snippets/sending/same-currency.mdx
Line: 40-42

Comment:
The `<Tip>` in the snippet is more terse than the equivalent tip in `send-payment.mdx`, which additionally lists valid rail values and explains when to use them. Since this snippet is imported in `global-p2p/sending-receiving-payments/sending-payments.mdx`, users landing on that page receive less guidance than users reading `send-payment.mdx`. Aligning the two tips ensures consistent documentation coverage regardless of which page a developer reaches.

```suggestion
<Tip>
  The `paymentRail` field is optional. If omitted, Grid selects a default rail for the destination. Specify a rail (e.g., `ACH`, `WIRE`, `RTP`, `FEDNOW`) when you need to control which payment network processes the transfer.
</Tip>
```

How can I resolve this? If you propose a fix, please make it concise.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

Fix in Claude Code


```json Success (201 Created)
{
"id": "Transaction:019542f5-b3e7-1d02-0000-000000000015",
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