fix(payment): Partial refunds

[olivermrbl]

What

• Pass refund amount to payment provider instead of full payment amount

Why

• Without it, payments would always be fully refunded regardless of the amount specified

Closes CC-336

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[riqwan]

nice! How did you come across this? 😄

[olivermrbl]

nice! How did you come across this? 😄

Currently setting up an end-to-end store with 3rd party providers installed and noticed this happened with Stripe payments