We have done a load of Direct Debit integrations for membership associations and charities over the years. Associations are different to charities – for membership, the direct debit amount changes frequently, and there are services running off the back off it, as opposed to recurring donations which are relatively easy.
When it came down to it, there was only one real DD partner that could do all the things through its API that we demanded of a fully automated solution, and that was GoCardless. Here’s why:-

• Hosted online mandate-signup pages that were bulletproof and could slot into checkout processes seamlessly
• Fully documented and versatile REST API with all functionality exposed.
• Real time webhooks for all transactions and mandate adjustments
• Support for not just DD, but SEPA, Giro, BECS, NZ DD, ACH.
• Multicurrency support via transferwise that brought singlecurrency back into our CRM.

There is no other service in the marketspace that can do all of this.