Payments API - Coverage

Coverage of endpoints by connector

Route	Payplug	Sumup	Paypal_payments	Mollie	Gocardless	Stripe
GET /balances	✅	✅	✅	✅	✅	✅
GET /payments	✅	✅	✅	✅	✅	✅
GET /payments/{payment_id}	✅	✅	✅	✅	✅	✅
GET /refunds	✅	✅	✅	✅	✅	✅
GET /transactions	✅	❌	❌	✅	✅	❌

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