The Adaptive Payments APIs are no longer being approved for new merchants (in most cases.) Look at PayPal Commerce Platform instead: https://developer.paypal.com/docs/commerce-platform/
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Hello, Please see the following post on stack overflow for information regarding this error - https://stackoverflow.com/questions/32775620/adaptive-payments-unilateral-receiver-not-allowed-in-chained-payment-is-restric
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