Mention a single payment per transaction in payments overview

Author: SariSaar

content/concepts/payments/payments-overview/index.mdx

@@ -6,7 +6,7 @@ description:
 published: true
 ---
 
-import { Steps } from 'nextra/components';
+import { Callout, Steps } from 'nextra/components';
 
 # Payments
 
@@ -176,6 +176,13 @@ over the transaction process. In terms of payments, you can make
 parallel paths depending on your payment strategy, and you can fine-tune
 the timeline of different actions to suit your marketplace.
 
+<Callout type="info">
+  Even when using parallel paths, a single transaction can only ever
+  have a single PaymentIntent associated with it. When customizing your
+  transaction process, make sure that a single path can only process a
+  single payment to avoid issues.
+</Callout>
+
 You can edit the transaction processes on your marketplace with
 [Sharetribe CLI](/how-to/transaction-process/edit-transaction-process-with-sharetribe-cli/).
 If you use Sharetribe Web Template, you will also need to make some