SEPA Direct Debit Core vs B2B: Developer Guide
Stripe, Adyen and GoCardless all support SEPA Direct Debit, but none of them will collect under the B2B scheme, and Mollie doesn't document it eithe…
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Apple Pay Token Decryption vs Google Pay ECv2
Apple's own reference page for decrypting an Apple Pay token currently gets the key derivation wrong. The KDF table lists the hash function where th…
Card Decline Codes: Visa vs Mastercard Retry Rules
Visa now lets a merchant retry a soft-declined card up to 20 times in 30 days, not 15. The figure sits in Table 7-2 of the Visa Core Rules dated 18…