fix(paypal): throw on API failure and fix collectCard data shape

[nehaaprasad]

summary

• Fix PayPal payment URL generation by correcting stored PayPal order data and improving API error handling

Changes

• Throw when PayPal order creation API fails or returns an invalid response (instead of returning {})
• Persist HOLD payments as { order: ... } to match the expected frontend data shape (data.order.links)

Test

• Verified PayPal flow should show the payment button instead of Couldn't obtain payment URL (manual e2e)

fix : #28513

Ctrl+K to generate command

[cubic-dev-ai]

No issues found across 2 files

[anikdhabal]

Thanks for your work @naaa760
#28513 (comment)