Add support for gift card with SKU 18732

[rndquu]

We have the feature of minting gift cards for crypto rewards which works this way:

1. pay.ubq.fi checks contributor's country
2. If contributor's country is in the MC allow list 3052024.xlsx then offer gift card with SKU 18597
3. Otherwise try to find the best card SKU from MasterCard International.xlsx

Reloadly has recently added a new tokenized card SKU:

We have a new sku that may be of interest to you: 

SKU: 18732
Name: Mastercard Prepaid USD Debit (Virtual only) US
5 - 1000 USD

Product Description:
Your Virtual Promotional Prepaid Mastercard can be used online, for phone/mail orders, or in stores that accept mobile wallet where Debit Mastercard is accepted. This card must be used within 6 months from the time you receive your link. Please Note: A 2% currency conversion fee will apply if the merchant settles in a currency other than USD

This card works in 130 Countries

SKU_ 18732 - Countries covered (5).xlsx

It makes sense to support a new SKU 18732 this way:

1. pay.ubq.fi checks contributor's country
2. If contributor's country is in the MC allow list 3052024.xlsx then offer gift card with SKU 18597
3. If contributor's country is in the SKU_ 18732 - Countries covered (5).xlsx the offer gift card with SKU 18732
4. Otherwise try to find the best card SKU from MasterCard International.xlsx

So as a part of this issue we should make sure that SKU 18732 is supported in these pages:

• https://github.com/ubiquity/pay.ubq.fi/blob/9b88dd6ffe04a13650d51a055441696a13047be9/static/index.html (redeem gift card)
• https://github.com/ubiquity/pay.ubq.fi/blob/9b88dd6ffe04a13650d51a055441696a13047be9/static/ubiquity-dollar.html (mint gift card for UUSD)

Related comment.

[0x4007]

What's so special about this specific product and why would we need to allocate 4 hours of work just to add a single extra card? Don't we already have hundreds of options?