**institution_id** | **String** | Identifier of the acquirer. This number is usually assigned by Visa. Applicable for VPC, GPX (gpx), CMCIC (cmcic), EFTPOS, CB2A, CUP, American Express Direct (amexdirect) and Six (six) processors. Validation details (for selected processors)... <table> <thead><tr><th>Processor</th><th>Acceptance Type</th><th>Required</th><th>Min. Length</th><th>Max. Length</th><th>Regex</th><th>Default Value</th></tr></thead> <tr><td>American Express Direct</td><td>cnp, cp, hybrid</td><td>Yes</td><td>1</td><td>13</td><td>^[0-9]+$</td><td>1111</td></tr> </table> | [optional]
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