Hi Bobcaygeon, 

Thanks for reaching out. Trying to get some clarification from the Sage 50 support team for you on this. Our blog Stripe, PayPal, and Paya: Which one is best for your needs? has the details below (stripe appears to be clear about it's functionality). 

Countries and Regions Supported

Stripe

"Stripe supports processing payments in 135+ currencies, allowing you to charge customers in their native currency while receiving funds in yours."  - Supported Currencies

PayPal 

PayPal currently doesn't serve: Lebanon, Afghanistan. Iraq, Iran, Bangladesh, Cameroon, Central African Republic, Cote D'Ivoire (Ivory Coast), North Korea, Haiti, Liberia, Libya, Myanmar, Pakistan, Palestinian territories, South Sudan, Sudan, Syria, Timor-Leste, and Uzbekistan.

• See: Countries and Regions Supported by PayPal 

Paya

Paya advertises that "business can happen anywhere with Paya mobile payments" - paya.com

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Will update you with any news. 

Warm Regards, 
Erzsi

Received a fast response, the team confirms that you cannot use invoice payments with foreign currency, Sage 50 CA doesn't currently support it.