The Rest APIs are not working on sandbox on Paypal APEX website. https://www.paypal.com/apex/product-profile/ordersv2/getAccessToken sandbox credentials: ClientId: AaneqYHriwEPePvQ0Z-JIFknZgbns-mDGUuJb-e6fuKchjobQl7gdWjcA26BWEkBZ1CWQZxZKabxVnyO Secret: EChuuFlhL9vcVOmjMTJYxgODpRivGYA1fv4T4OBNQU93TXarZFYIXDRYzme2gvcjY-jY2TYdU1wBxsCU
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